diff --git a/ProjectLighthouse.sln.DotSettings b/ProjectLighthouse.sln.DotSettings
index 698d69e9..cd0a7049 100644
--- a/ProjectLighthouse.sln.DotSettings
+++ b/ProjectLighthouse.sln.DotSettings
@@ -72,6 +72,7 @@
 	<s:String x:Key="/Default/CodeStyle/CSharpVarKeywordUsage/ForOtherTypes/@EntryValue">UseExplicitType</s:String>
 	<s:String x:Key="/Default/CodeStyle/CSharpVarKeywordUsage/ForSimpleTypes/@EntryValue">UseExplicitType</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=MM/@EntryIndexedValue">MM</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=NP/@EntryIndexedValue">NP</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=Method/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="AaBb"&gt;&lt;ExtraRule Prefix="" Suffix="" Style="aaBb" /&gt;&lt;/Policy&gt;</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=PrivateConstants/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="aaBb" /&gt;</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/PredefinedNamingRules/=PrivateStaticReadonly/@EntryIndexedValue">&lt;Policy Inspect="True" Prefix="" Suffix="" Style="aaBb" /&gt;</s:String>
@@ -97,6 +98,7 @@
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=luckydip/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=mmpick/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=mmpicks/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=npdata/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=NPEA/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=NPHG/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=PCAS/@EntryIndexedValue">True</s:Boolean>
diff --git a/ProjectLighthouse/Controllers/FriendsController.cs b/ProjectLighthouse/Controllers/FriendsController.cs
new file mode 100644
index 00000000..6cd14fce
--- /dev/null
+++ b/ProjectLighthouse/Controllers/FriendsController.cs
@@ -0,0 +1,92 @@
+#nullable enable
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+using System.Xml.Serialization;
+using LBPUnion.ProjectLighthouse.Helpers;
+using LBPUnion.ProjectLighthouse.Serialization;
+using LBPUnion.ProjectLighthouse.Types;
+using LBPUnion.ProjectLighthouse.Types.Profiles;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace LBPUnion.ProjectLighthouse.Controllers
+{
+    [ApiController]
+    [Route("LITTLEBIGPLANETPS3_XML/")]
+    public class FriendsController : ControllerBase
+    {
+        private readonly Database database;
+
+        public FriendsController(Database database)
+        {
+            this.database = database;
+        }
+
+        [HttpPost("npdata")]
+        public async Task<IActionResult> NPData()
+        {
+            User? user = await this.database.UserFromRequest(this.Request);
+            if (user == null) return this.StatusCode(403, "");
+
+            this.Request.Body.Position = 0;
+            string bodyString = await new StreamReader(this.Request.Body).ReadToEndAsync();
+
+            XmlSerializer serializer = new(typeof(NPData));
+            NPData? npData = (NPData?)serializer.Deserialize(new StringReader(bodyString));
+            if (npData == null) return this.BadRequest();
+
+            List<int> friends = new();
+            foreach (string friendName in npData.Friends)
+            {
+                User? friend = await this.database.Users.FirstOrDefaultAsync(u => u.Username == friendName);
+                if (friend == null) continue;
+
+                friends.Add(friend.UserId);
+            }
+
+            List<int> blockedUsers = new();
+            foreach (string blockedUserName in npData.BlockedUsers)
+            {
+                User? blockedUser = await this.database.Users.FirstOrDefaultAsync(u => u.Username == blockedUserName);
+                if (blockedUser == null) continue;
+
+                blockedUsers.Add(blockedUser.UserId);
+            }
+
+            if (FriendHelper.FriendIdsByUserId.ContainsKey(user.UserId))
+            {
+                FriendHelper.FriendIdsByUserId.Remove(user.UserId);
+                FriendHelper.BlockedIdsByUserId.Remove(user.UserId);
+            }
+
+            FriendHelper.FriendIdsByUserId.Add(user.UserId, friends.ToArray());
+            FriendHelper.BlockedIdsByUserId.Add(user.UserId, blockedUsers.ToArray());
+
+            return this.Ok();
+        }
+
+        [HttpGet("myFriends")]
+        public async Task<IActionResult> MyFriends()
+        {
+            User? user = await this.database.UserFromRequest(this.Request);
+            if (user == null) return this.StatusCode(403, "");
+
+            if (!FriendHelper.FriendIdsByUserId.TryGetValue(user.UserId, out int[]? friendIds) || friendIds == null)
+            {
+                return this.NotFound();
+            }
+
+            string friends = "";
+            foreach (int friendId in friendIds)
+            {
+                User? friend = await this.database.Users.Include(u => u.Location).FirstOrDefaultAsync(u => u.UserId == friendId);
+                if (friend == null) continue;
+
+                friends += friend.Serialize();
+            }
+
+            return this.Ok(LbpSerializer.StringElement("myFriends", friends));
+        }
+    }
+}
\ No newline at end of file
diff --git a/ProjectLighthouse/Helpers/FriendHelper.cs b/ProjectLighthouse/Helpers/FriendHelper.cs
new file mode 100644
index 00000000..9475e582
--- /dev/null
+++ b/ProjectLighthouse/Helpers/FriendHelper.cs
@@ -0,0 +1,12 @@
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace LBPUnion.ProjectLighthouse.Helpers
+{
+    [NotMapped]
+    public static class FriendHelper
+    {
+        public static Dictionary<int, int[]> FriendIdsByUserId = new();
+        public static Dictionary<int, int[]> BlockedIdsByUserId = new();
+    }
+}
\ No newline at end of file
diff --git a/ProjectLighthouse/Types/Profiles/NPData.cs b/ProjectLighthouse/Types/Profiles/NPData.cs
new file mode 100644
index 00000000..a117d6bf
--- /dev/null
+++ b/ProjectLighthouse/Types/Profiles/NPData.cs
@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.Xml.Serialization;
+
+namespace LBPUnion.ProjectLighthouse.Types.Profiles
+{
+    [XmlRoot("npdata")]
+    [XmlType("npdata")]
+    public class NPData
+    {
+        [XmlArray("friends")]
+        [XmlArrayItem("npHandle")]
+        public List<string> Friends { get; set; }
+
+        [XmlArray("blocked")]
+        [XmlArrayItem("npHandle")]
+        public List<string> BlockedUsers { get; set; }
+    }
+}
\ No newline at end of file