Kiba pt 1 has the fastest grabs while pt 2s gatsuga is more effective and fast. Its best to chain it after a combo for effective results plus if you get hit then akamaru still deals damage
Chiyo is just as good since she has a double defense being her puppets if close or if knocked down, her own defense. Plus chaining her special move after a combo takes down loads of health
Best supports are tobi, hebi sasuke, itachi for offense and pain for defense
Edo madara is slow, his moves are just flashy
Minato is crap against fast hitting characters but good for evading
Sage Mode naruto is a good all rounder due to his combos
Kakashi is lame
It just depends on how you mix and match, those supports are the best regardless what main you choose