yea boy, now I got it!

OwnChar/Data/Providers/JsonFile/Model/JsonCharacter.cs

@@ -0,0 +1,10 @@
+using OwnChar.Model;
+
+namespace OwnChar.Data.Providers.JsonFile.Model
+{
+    public class JsonCharacter : Character
+    {
+        public List<JsonProp> Properties { get; } = [];
+        public List<JsonPropCat> PropertyCategories { get; } = [];
+    }
+}

OwnChar/Data/Providers/JsonFile/Model/JsonGroup.cs

@@ -0,0 +1,11 @@
+using OwnChar.Model;
+
+namespace OwnChar.Data.Providers.JsonFile.Model
+{
+    public class JsonGroup : Group
+    {
+        public List<JsonUserProfile> Owner { get; } = [];
+        public List<JsonUserProfile> Members { get; } = [];
+        public List<JsonCharacter> Characters { get; } = [];
+    }
+}

OwnChar/Data/Providers/JsonFile/Model/JsonProp.cs

@@ -0,0 +1,9 @@
+using OwnChar.Model;
+
+namespace OwnChar.Data.Providers.JsonFile.Model
+{
+    public class JsonProp : Property
+    {
+        public JsonPropCat? Category { get; set; } = null;
+    }
+}

OwnChar/Data/Providers/JsonFile/Model/JsonPropCat.cs

@@ -0,0 +1,8 @@
+using OwnChar.Model;
+
+namespace OwnChar.Data.Providers.JsonFile.Model
+{
+    public class JsonPropCat : PropertyCategory
+    {
+    }
+}

OwnChar/Data/Providers/JsonFile/Model/JsonUserAccount.cs

@@ -0,0 +1,9 @@
+using OwnChar.Model;
+
+namespace OwnChar.Data.Providers.JsonFile.Model
+{
+    public class JsonUserAccount : UserAccount
+    {
+        public JsonUserProfile? Profile { get; set; }
+    }
+}

OwnChar/Data/Providers/JsonFile/Model/JsonUserProfile.cs

@@ -0,0 +1,8 @@
+using OwnChar.Model;
+
+namespace OwnChar.Data.Providers.JsonFile.Model
+{
+    public class JsonUserProfile : UserProfile
+    {
+    }
+}