The more cartoons, the better.

Rebellious Lu Lu badminton modified the animation (two male masters, sometimes cooperating and sometimes opposing, love each other and kill each other (wrong): Lu Lu badminton modified, Suzaku)

Death note animation, cartoon (two male masters, opposites, love each other and kill each other (laughs): God jathyapple, L)

Dream eater animation, cartoon (two men and good friends)

Steel alchemist animation, cartoon (two brothers, I don't know if it's the two heroes)

Black deacon animation, cartoon (master and housekeeper, I don't know if they are both masters)

Future urban animation (two men are good friends and finally abandon their women together ...)

Legend of the knight errant animation, comics (the original cooperation ended in complete opposition, and comics are a pit, the plot is too dark)

Psychometric animation (do men and enemies count? Because it's just the big boss)

Jue Yuan's storm animation and comics (two people are good friends, at least on the surface)

Zhan Yong animation, comics (instant noodles, a few minutes per episode. Two people have an s and an m)

ZETMAN animation, cartoon (the initial cooperation and final opposition between the two people, the animation is a pit, and the comic plot is a bit dark)

The hidden king of animation (good gay friend, good gay friend)

Gay friends Hero Biography (also known as Tiger Rabbit) animation (the name hits the nail on the head ... is actually a good friend, not a bad person. )

The Sixth Sense Animation of Night (Super Brothers II)

Zombie lending animation, comics (not the fate of good friends)

Something like that