I haven't made plugins in like months, but I'm getting back into it, I was windering how I can remove a player from the tab list, I suspect you need packets but I'm not sure, also, how do you change the player name, I feel like I figured it out before but I don't remember, I am 100% sure I figured out how to change the tab name COLOR, though.
Code: player.setPlayerListName(String name) Chances the player's name in TAB, also known as the player list
As to removing a player, this guy did it here: https://gist.github.com/aadnk/3928137 It's old but it might still work.