This was just asked a while ago (use search bar), anyways he buffs by 30% if you're full health.

Thank you so much :D

30 or 40% im dont remember lol ;P

Are you sure it's just 30%? When I tested it against Kakashi, I did with Asuma 59-78% more dmg than without him.

I still have my calculations here:

With equipment:
~20.000 dmg without Asuma WB
~32.500 dmg with Asuma WB

Without equipment
~11.000 dmg without Asuma WB
~14.700 dmg with Asuma WB

I did serveral rounds and always aborted the fight after my Main attacked with Odama Rasengan, and only took the damage she dealt.

Hey there, don't forget, that most attacks scale of off both tai and nin. If you have both stats buffed, the dmg increase is much higher.

I fail to see how this affects the Asuma buff, having only my Main with and without Asuma standing on the field. The only difference would be Asuma's Buff regarding the damage coming form my Main.

What I mean, if you buff ninjutsu for a nin/tai skill, it gets stronger, but if you buff ninjutsu and taijutsu, it gets even stronger.

It doesn't matter if you use pure taijutsu/ninjutsu

Ah, I see, since Asuma buffs Nin and Tai and my Main does Nin and Tai, it's a 60% Buff since Nin and Tai are increased by 30% each. Yea that makes sense, I've overlooked that somehow...