I worked out the best tactic for every character.
P-Bot: Spam buzzsawsaw on ground, if necessary use quick attacks.
Hank: Don't get TOO near enemies, but not too far, because the guns have a weird mid-distance range. Also spam crouch attacks, and parry every now and then for ammo.
Alloy: Full combo of standard strong attacks -> Strong attack air combo after 4th ground attack. If necessary when playing Keep-Away, use the Strong juggle, since the spin gains height and the buzzsaw launches you forward.
Nene: Spam quick attacks, and stay on ground. Only use strong attack to throw knives.
Samurai A******: Alternate between fast and and strong attacks, jumping every now and then to dodge a strong attack.
Piconjo: CHARGE!! Also good at juggling, for the in-flight fight based fighters.
Salad Fingers: Keep-away. Jump/block often, and spam strong attacks and weaponry.
Gun is very cheap against others. If you're fighting this guy, juggle him or use guns, as he has low health and gunfire cannot be blocked.
Convict (not transformed): Spam strong crouching and strong attacks.
Tankman: Uhh...I dunno. Sorry, but this guy is one of the hardest to fully control.
Well okay, I'll level with you. Spam quick attacks and gun. Gun has one use.
Review: Teh pwn.
Oh, AND GO GO GO HANK!