Bleach

Hard mode:
Finish the entire game once. After, hold L1 + R1 and choose
"Load Game". Enemies hit you with 2x damage.

Unlock characters:
Byakuya - Finish level 29 with more than 1900000 pts.
Gin - Finish level 11 with more than 1600000 pts.
Izuru - Finish level 11 with more than 700000 pts.
Rangiku - Finish level 11 with more than 400000 pts.
Renji - Finish level 29 with more than 1000000 pts.
Toushiro - Finish level 11 with more than 1300000 pts.
Urahara - Finishthe game twice with more than 2200000 pts.
Yoruichi - Finishthe game twice with more than 2500000 pts.