In dbz black goku or someone arc ki fruit or something
Each one gives 2000 or more power
He will literally become planet buster eating single one of them
the going to dbz or magic world to increase in int stat like fairy tail archive magic and thought acceleration
you can even get sacred gears from dxd
wepons from that highschool anine
but all is useless if u don’t send him to a anime world as there will be no danger in real world