diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/CoreStats.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/CoreStats.kt
index cb173ee2..7a284fcd 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/CoreStats.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/CoreStats.kt
@@ -4,10 +4,10 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * The core statistics for a player or team within a match or game.
  */
 data class CoreStats(
-    val shots: Int = 0,
-    val goals: Int = 0,
-    val saves: Int = 0,
-    val assists: Int = 0,
-    val score: Int = 0,
-    val shootingPercentage: Float = 0F,
+    val shots: Int,
+    val goals: Int,
+    val saves: Int,
+    val assists: Int,
+    val score: Int,
+    val shootingPercentage: Float,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Format.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Format.kt
index 336c523f..ae139c0f 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Format.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Format.kt
@@ -5,8 +5,8 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * For a best of 7, we would have something like (type: best, length: 7)
  */
 data class Format(
-    val type: String = "",
-    val length: Int = 0,
+    val type: String,
+    val length: Int,
 ) {
     /**
      * Depending on the [type] of format, return the number of games
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Game.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Game.kt
index 9298a1d1..76a166f6 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Game.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Game.kt
@@ -4,12 +4,12 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * Information about a single [Game] inside a [Match] between two teams.
  */
 data class Game(
-    val id: String = "",
-    val blue: GameTeamResult = GameTeamResult(),
-    val orange: GameTeamResult = GameTeamResult(),
-    val map: String = "",
-    val number: Int = 0,
-    val duration: Int = GAME_DEFAULT_DURATION_SECONDS,
+    val id: String,
+    val blue: GameTeamResult,
+    val orange: GameTeamResult,
+    val map: String,
+    val number: Int,
+    val duration: Int,
 ) {
     companion object {
         /**
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameOverview.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameOverview.kt
index 9cbbd5a3..64038954 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameOverview.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameOverview.kt
@@ -7,8 +7,8 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * For detailed info, we can look it up by [id].
  */
 data class GameOverview(
-    val id: String = "",
-    val blueScore: Int = 0,
-    val orangeScore: Int = 0,
-    val durationSeconds: Int = 0,
+    val id: String,
+    val blueScore: Int,
+    val orangeScore: Int,
+    val durationSeconds: Int,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameTeamResult.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameTeamResult.kt
index d084c893..01dbce8a 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameTeamResult.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/GameTeamResult.kt
@@ -1,7 +1,7 @@
 package com.adammcneilly.pocketleague.shared.app.core.models
 
 /**
- * Defines information about the reuslt of a [team] within a game.
+ * Defines information about the result of a [team] within a game.
  *
  * @property[goals] The number of goals scored by this team during the game.
  * @property[winner] True if this team won the specific game.
@@ -11,10 +11,10 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * @property[players] The players for this [team] and how they performed in this game.
  */
 data class GameTeamResult(
-    val goals: Int = -1,
-    val winner: Boolean = false,
-    val matchWinner: Boolean = false,
-    val team: Team = Team(),
-    val teamStats: Stats = Stats(),
-    val players: List<GamePlayerResult> = emptyList(),
+    val goals: Int,
+    val winner: Boolean,
+    val matchWinner: Boolean,
+    val team: Team,
+    val teamStats: Stats,
+    val players: List<GamePlayerResult>,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/MatchTeamResult.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/MatchTeamResult.kt
index 0d3f4eef..9ec1268a 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/MatchTeamResult.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/MatchTeamResult.kt
@@ -4,9 +4,9 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * The result of a particular [team] within a [Match].
  */
 data class MatchTeamResult(
-    val score: Int = 0,
-    val winner: Boolean = false,
-    val team: Team = Team(),
-    val players: List<GamePlayerResult> = emptyList(),
-    val stats: Stats? = null,
+    val score: Int,
+    val winner: Boolean,
+    val team: Team,
+    val players: List<GamePlayerResult>,
+    val stats: Stats?,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Player.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Player.kt
index 45dffb87..8af33a69 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Player.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Player.kt
@@ -4,12 +4,12 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * Represents a person who can compete in an RLCS event.
  */
 data class Player(
-    val id: String = "",
-    val slug: String = "",
-    val tag: String = "",
-    val name: String = "",
-    val currentTeamId: String = "",
-    val countryCode: String = "",
-    val isCoach: Boolean = false,
-    val isSubstitute: Boolean = false,
+    val id: String,
+    val slug: String,
+    val tag: String,
+    val name: String,
+    val currentTeamId: String,
+    val countryCode: String,
+    val isCoach: Boolean,
+    val isSubstitute: Boolean,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Stats.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Stats.kt
index dbcd94ff..b667e6ea 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Stats.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Stats.kt
@@ -4,5 +4,5 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * A collection of different types of statistics for a player or team.
  */
 data class Stats(
-    val core: CoreStats = CoreStats(),
+    val core: CoreStats,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Team.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Team.kt
index 93982760..c5db661d 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Team.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/core/models/Team.kt
@@ -5,11 +5,11 @@ package com.adammcneilly.pocketleague.shared.app.core.models
  * League event.
  */
 data class Team(
-    val id: String = "",
-    val name: String = "TBD",
-    val lightThemeImageURL: String? = null,
+    val id: String,
+    val name: String,
+    val isFavorite: Boolean,
+    val isActive: Boolean,
+    val region: Region,
+    val lightThemeImageURL: String?,
     val darkThemeImageURL: String? = lightThemeImageURL,
-    val isFavorite: Boolean = false,
-    val isActive: Boolean = false,
-    val region: Region = Region.Unknown,
 )
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGame.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGame.kt
index bd90b589..10aae7e9 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGame.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGame.kt
@@ -1,7 +1,6 @@
 package com.adammcneilly.pocketleague.shared.app.data.octanegg.dto
 
 import com.adammcneilly.pocketleague.shared.app.core.models.Game
-import com.adammcneilly.pocketleague.shared.app.core.models.GameTeamResult
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
@@ -35,6 +34,14 @@ data class OctaneGGGame(
      * Converts an [OctaneGGGame] to a [Game] in our domain.
      */
     fun toGame(): Game {
+        requireNotNull(this.blue) {
+            "Cannot parse OctaneGGGame without blue team entity."
+        }
+
+        requireNotNull(this.orange) {
+            "Cannot parse OctaneGGGame without orange team entity."
+        }
+
         // Currently the octane.gg api does not include a map name for
         // this map ID, so let's override it ourselves.
         val mapName = when (this.map?.id) {
@@ -44,8 +51,8 @@ data class OctaneGGGame(
 
         return Game(
             id = this.id.orEmpty(),
-            blue = this.blue?.toGameTeamResult() ?: GameTeamResult(),
-            orange = this.orange?.toGameTeamResult() ?: GameTeamResult(),
+            blue = this.blue.toGameTeamResult(),
+            orange = this.orange.toGameTeamResult(),
             map = mapName,
             number = this.number ?: 0,
             duration = this.duration ?: Game.GAME_DEFAULT_DURATION_SECONDS,
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGameTeamResult.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGameTeamResult.kt
index 593fb9f9..342ac51d 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGameTeamResult.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGGameTeamResult.kt
@@ -1,8 +1,6 @@
 package com.adammcneilly.pocketleague.shared.app.data.octanegg.dto
 
 import com.adammcneilly.pocketleague.shared.app.core.models.GameTeamResult
-import com.adammcneilly.pocketleague.shared.app.core.models.Stats
-import com.adammcneilly.pocketleague.shared.app.core.models.Team
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
@@ -24,12 +22,24 @@ data class OctaneGGGameTeamResult(
      * Convert an [OctaneGGGameTeamResult] to a [GameTeamResult] in our domain.
      */
     fun toGameTeamResult(): GameTeamResult {
+        requireNotNull(this.team) {
+            "Cannot parse OctaneGGGameTeamResult without team entity."
+        }
+
+        requireNotNull(this.team.team) {
+            "Cannot parse OctaneGGGameTeamResult without inner team entity."
+        }
+
+        requireNotNull(this.team.stats) {
+            "Cannot parse OctaneGGGameTeamResult without stats entity."
+        }
+
         return GameTeamResult(
-            goals = this.team?.stats?.core?.goals ?: 0,
+            goals = this.team.stats.core?.goals ?: 0,
             winner = this.gameWinner == true,
-            team = this.team?.team?.toTeam() ?: Team(),
+            team = this.team.team.toTeam(),
             matchWinner = this.matchWinner == true,
-            teamStats = this.team?.stats?.toStats() ?: Stats(),
+            teamStats = this.team.stats.toStats(),
             players = this.players?.map(OctaneGGPlayerStats::toGamePlayerResult).orEmpty(),
         )
     }
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatch.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatch.kt
index 50a028b9..4b4440c3 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatch.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatch.kt
@@ -1,10 +1,6 @@
 package com.adammcneilly.pocketleague.shared.app.data.octanegg.dto
 
-import com.adammcneilly.pocketleague.shared.app.core.models.Event
-import com.adammcneilly.pocketleague.shared.app.core.models.EventStage
-import com.adammcneilly.pocketleague.shared.app.core.models.Format
 import com.adammcneilly.pocketleague.shared.app.core.models.Match
-import com.adammcneilly.pocketleague.shared.app.core.models.MatchTeamResult
 import com.adammcneilly.pocketleague.shared.app.core.models.StageRound
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
@@ -37,14 +33,34 @@ data class OctaneGGMatch(
      * Converts an [OctaneGGMatch] to a [Match] in our domain.
      */
     fun toMatch(): Match {
+        requireNotNull(this.event) {
+            "Cannot parse OctaneGGMatch without event entity."
+        }
+
+        requireNotNull(this.blue) {
+            "Cannot parse OctaneGGMatch without blue team entity."
+        }
+
+        requireNotNull(this.orange) {
+            "Cannot parse OctaneGGMatch without orange team entity."
+        }
+
+        requireNotNull(this.stage) {
+            "Cannot parse OctaneGGMatch without stage entity."
+        }
+
+        requireNotNull(this.format) {
+            "Cannot parse OctaneGGMatch without format entity."
+        }
+
         return Match(
             id = this.id.orEmpty(),
-            event = this.event?.toEvent() ?: Event(),
+            event = this.event.toEvent(),
             dateUTC = this.dateUTC,
-            blueTeam = this.blue?.toMatchTeamResult() ?: MatchTeamResult(),
-            orangeTeam = this.orange?.toMatchTeamResult() ?: MatchTeamResult(),
-            stage = this.stage?.toEventStage() ?: EventStage(),
-            format = this.format?.toFormat() ?: Format(),
+            blueTeam = this.blue.toMatchTeamResult(),
+            orangeTeam = this.orange.toMatchTeamResult(),
+            stage = this.stage.toEventStage(),
+            format = this.format.toFormat(),
             gameOverviews = this.games?.map(OctaneGGGameOverview::toGameOverview).orEmpty(),
             // Octane.GG API has no concept of a stage round, so we'll just return a default here.
             round = StageRound(0, ""),
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatchTeamResult.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatchTeamResult.kt
index 09258261..e0354e1d 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatchTeamResult.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGMatchTeamResult.kt
@@ -1,7 +1,6 @@
 package com.adammcneilly.pocketleague.shared.app.data.octanegg.dto
 
 import com.adammcneilly.pocketleague.shared.app.core.models.MatchTeamResult
-import com.adammcneilly.pocketleague.shared.app.core.models.Team
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
@@ -28,11 +27,19 @@ data class OctaneGGMatchTeamResult(
      * Converts an [OctaneGGMatchTeamResult] to a [MatchTeamResult] in our domain.
      */
     fun toMatchTeamResult(): MatchTeamResult {
+        requireNotNull(this.team) {
+            "Cannot parse OctaneGGMatchTeamResult without team entity."
+        }
+
+        requireNotNull(this.team.team) {
+            "Cannot parse OctaneGGMatchTeamResult without inner team entity."
+        }
+
         return MatchTeamResult(
             score = this.score ?: 0,
             winner = this.winner ?: false,
-            team = this.team?.team?.toTeam() ?: Team(),
-            stats = this.team?.stats?.toStats(),
+            team = this.team.team.toTeam(),
+            stats = this.team.stats?.toStats(),
             players = this.players?.map(OctaneGGPlayerStats::toGamePlayerResult).orEmpty(),
         )
     }
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGPlayerStats.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGPlayerStats.kt
index 084b0f8d..7d0d028e 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGPlayerStats.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGPlayerStats.kt
@@ -1,8 +1,6 @@
 package com.adammcneilly.pocketleague.shared.app.data.octanegg.dto
 
 import com.adammcneilly.pocketleague.shared.app.core.models.GamePlayerResult
-import com.adammcneilly.pocketleague.shared.app.core.models.Player
-import com.adammcneilly.pocketleague.shared.app.core.models.Stats
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
@@ -26,9 +24,17 @@ data class OctaneGGPlayerStats(
      * can represent a player and their stats in any situation.
      */
     fun toGamePlayerResult(): GamePlayerResult {
+        requireNotNull(this.player) {
+            "Cannot parse OctaneGGPlayerStats without player entity."
+        }
+
+        requireNotNull(this.stats) {
+            "Cannot parse OctaneGGPlayerStats without stats entity."
+        }
+
         return GamePlayerResult(
-            player = this.player?.toPlayer() ?: Player(),
-            stats = this.stats?.toStats() ?: Stats(),
+            player = this.player.toPlayer(),
+            stats = this.stats.toStats(),
         )
     }
 }
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGStats.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGStats.kt
index 1aacc460..5b7988ce 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGStats.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGStats.kt
@@ -1,6 +1,5 @@
 package com.adammcneilly.pocketleague.shared.app.data.octanegg.dto
 
-import com.adammcneilly.pocketleague.shared.app.core.models.CoreStats
 import com.adammcneilly.pocketleague.shared.app.core.models.Stats
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
@@ -25,8 +24,12 @@ data class OctaneGGStats(
      * Converts an [OctaneGGStats] entity to a [Stats] entity.
      */
     fun toStats(): Stats {
+        requireNotNull(this.core) {
+            "Cannot parse OctaneGGStats without core entity."
+        }
+
         return Stats(
-            core = this.core?.toCoreStats() ?: CoreStats(),
+            core = this.core.toCoreStats(),
         )
     }
 }
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamDetail.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamDetail.kt
index 87aa00dd..e3297c61 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamDetail.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamDetail.kt
@@ -18,6 +18,10 @@ data class OctaneGGTeamDetail(
      * Converts an [OctaneGGTeamDetail] entity to a [Team] in our domain.
      */
     fun toTeam(): Team {
-        return this.team?.toTeam() ?: Team()
+        requireNotNull(team) {
+            "Cannot parse OctaneGGTeamDetail without team entity."
+        }
+
+        return this.team.toTeam()
     }
 }
diff --git a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamOverview.kt b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamOverview.kt
index 7ea6c67e..6992cce6 100644
--- a/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamOverview.kt
+++ b/shared/app/src/commonMain/kotlin/com/adammcneilly/pocketleague/shared/app/data/octanegg/dto/OctaneGGTeamOverview.kt
@@ -33,6 +33,8 @@ data class OctaneGGTeamOverview(
             name = this.name ?: "TBD",
             lightThemeImageURL = this.image,
             region = OctaneGGRegionMapper.fromString(this.region.orEmpty()),
+            isFavorite = false,
+            isActive = false,
         )
     }
 }