First step in starting to fix this issue

src/main/java/com/gmail/nossr50/datatypes/player/McMMOPlayer.java

@@ -91,6 +91,8 @@ public class McMMOPlayer {
     private boolean isUsingUnarmed;
     private final FixedMetadataValue playerMetadata;
 
+    private String nameTag;
+
     public McMMOPlayer(Player player) {
         String playerName = player.getName();
 
@@ -949,4 +951,12 @@ public class McMMOPlayer {
     public FixedMetadataValue getPlayerMetadata() {
         return playerMetadata;
     }
+
+    public String getNameTag() {
+        return nameTag;
+    }
+
+    public void setNameTag(String nameTag) {
+        this.nameTag = nameTag;
+    }
 }

src/main/java/com/gmail/nossr50/listeners/TagListener.java

@@ -0,0 +1,57 @@
+package com.gmail.nossr50.listeners;
+
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import com.gmail.nossr50.datatypes.player.McMMOPlayer;
+import com.gmail.nossr50.util.player.UserManager;
+
+import org.kitteh.tag.AsyncPlayerReceiveNameTagEvent;
+
+public class TagListener implements Listener {
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onAsyncPlayerReceiveNameTag(AsyncPlayerReceiveNameTagEvent event) {
+        Player player = event.getNamedPlayer();
+        McMMOPlayer mcMMOPlayer = UserManager.getPlayer(player);
+
+        if (mcMMOPlayer == null) {
+            return;
+        }
+
+        String tag = event.getTag();
+        String colorlessTag = ChatColor.stripColor(tag);
+
+        if (colorlessTag.equals(tag)) {
+            mcMMOPlayer.setNameTag(null);
+            return;
+        }
+
+        if (colorlessTag.equals(player.getName()) && (mcMMOPlayer.getNameTag() == null || !mcMMOPlayer.getNameTag().equals(tag))) {
+            mcMMOPlayer.setNameTag(tag);
+        }
+
+        /*
+        mbax:
+            With TagAPI, you can set the name tag over anybody's head to any value.
+            You can have five people with the name 'Notch' (And one named 'notch' for
+            good measure). That makes it difficult to properly utilize the scoreboard
+            feature to match a changed name to a score for below name objective display.
+
+            Additionally, every single player can be seeing a different username over
+            the head of the same player. So even if you're just trying to detect colored usernames
+            you could be encountering 16 different colors before a username (15, generally, who does white?)
+            and maybe some format codes as well. The Scoreboard API doesn't support per-player setting of names,
+               so you'd have to add an entry for each.
+
+            At best, what you could do is listen to TagAPI's event on MONITOR priority and track all the names.
+            Check if a set name is the same as their actual name, sans colors. If yes, store that and each time
+            you update a player's below-name objective, update an OfflinePlayer with that colored version as well.
+            This is not a good idea if the objective will ever change DisplaySlot, particularly if it goes to the
+            sidebar, since you'll then need to clear the color ones.
+         */
+    }
+}

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -29,6 +29,7 @@ import com.gmail.nossr50.listeners.EntityListener;
 import com.gmail.nossr50.listeners.InventoryListener;
 import com.gmail.nossr50.listeners.PlayerListener;
 import com.gmail.nossr50.listeners.SelfListener;
+import com.gmail.nossr50.listeners.TagListener;
 import com.gmail.nossr50.listeners.WorldListener;
 import com.gmail.nossr50.locale.LocaleLoader;
 import com.gmail.nossr50.metrics.MetricsManager;
@@ -89,6 +90,7 @@ public class mcMMO extends JavaPlugin {
     private static boolean healthBarPluginEnabled;
     private static boolean noCheatPlusPluginEnabled;
     private static boolean compatNoCheatPlusPluginEnabled;
+    private static boolean tagapiPluginEnabled;
     private static boolean mcpcEnabled;
 
     // Config Validation Check
@@ -130,6 +132,7 @@ public class mcMMO extends JavaPlugin {
             healthBarPluginEnabled = getServer().getPluginManager().getPlugin("HealthBar") != null;
             noCheatPlusPluginEnabled = getServer().getPluginManager().getPlugin("NoCheatPlus") != null;
             compatNoCheatPlusPluginEnabled = getServer().getPluginManager().getPlugin("CompatNoCheatPlus") != null;
+            tagapiPluginEnabled = getServer().getPluginManager().getPlugin("TagAPI") != null && checkTagVersion();
 
             setupFilePaths();
 
@@ -445,6 +448,10 @@ public class mcMMO extends JavaPlugin {
         pluginManager.registerEvents(new InventoryListener(this), this);
         pluginManager.registerEvents(new SelfListener(), this);
         pluginManager.registerEvents(new WorldListener(this), this);
+
+        if (tagapiPluginEnabled) {
+            pluginManager.registerEvents(new TagListener(), this);
+        }
     }
 
     private void registerCustomRecipes() {
@@ -509,4 +516,17 @@ public class mcMMO extends JavaPlugin {
             getLogger().info("To enable, set Mods.Entity_Mods_Enabled to TRUE in config.yml.");
         }
     }
+
+    private boolean checkTagVersion() {
+        try {
+            Class.forName("org.kitteh.tag.AsyncPlayerReceiveNameTagEvent");
+        }
+        catch (final ClassNotFoundException e) {
+            getLogger().info("This TagAPI version does not have AsyncPlayerReceiveNameTagEvent");
+            getLogger().info("Please update TagAPI to ensure full compatibility with mcMMO");
+            return false;
+        }
+
+        return true;
+    }
 }

src/main/java/com/gmail/nossr50/util/scoreboards/ScoreboardManager.java

@@ -342,6 +342,10 @@ public class ScoreboardManager {
 
             for (ScoreboardWrapper wrapper : PLAYER_SCOREBOARDS.values()) {
                 wrapper.updatePowerLevel(player, power);
+
+                if (mcMMOPlayer.getNameTag() != null) {
+                    wrapper.updatePowerLevel(mcMMO.p.getServer().getOfflinePlayer(mcMMOPlayer.getNameTag()), power);
+                }
             }
         }
 

src/main/java/com/gmail/nossr50/util/scoreboards/ScoreboardWrapper.java

@@ -4,6 +4,7 @@ import java.util.List;
 import java.util.Map;
 
 import org.bukkit.ChatColor;
+import org.bukkit.OfflinePlayer;
 import org.bukkit.entity.Player;
 import org.bukkit.scheduler.BukkitRunnable;
 import org.bukkit.scheduler.BukkitTask;
@@ -558,4 +559,8 @@ public class ScoreboardWrapper {
     public void updatePowerLevel(Player player, int newPowerLevel) {
         powerObjective.getScore(player).setScore(newPowerLevel);
     }
+
+    public void updatePowerLevel(OfflinePlayer offlinePlayer, int newPowerLevel) {
+        powerObjective.getScore(offlinePlayer).setScore(newPowerLevel);
+    }
 }