Let's see... I'm just gonna go through the roster as of DOA5. Even for characters I don't play seriously. The bolded ones are my personal defaults.
Akira: C3, C5
Alpha: Any. Gonna use the new one when 5U releases.
Ayane: C1, C3, C4 (no hat, glasses), C6, C10
Bass: C1, C5, C7
Bayman: C2, C3, C6...