Shiki
Also, even better than New Game+, you can skip to any day that you want once you finish, making ever so much easier to CATCH EM ALL (pins I mean)
Also, I have over 3000 HP for my level 1 and nearly 200 base attack and defense for both Neku and Shiki. Extreme mode is a snap for everything but the end of the game. <3 the hollow leg sticker