Very much like the multiplayer playercard in Call of Duty Black Ops (1), having a playercard for a player's history in the Zombies game mode would be very awesome. This playercard could contain the following:
How many zombies have been killed:
Highest rounds on each map:
Average score per minute:
Revives/downs ratio:
and possibly:
Favorite perk: (PHD flop, dolvin diving for days! I hope dolvin diving makes a return, it's so incredible)
Favorite gun:
Gun upgraded the most times:
etc.
Thank you for reading my idea, and if any developers of the next Treyarch game ever read this I want to say keep up the great work and I really enjoy playing your game.