Is there even a single anime character that could do anything against this guy?
Goku can make him sad by having a wife, two kids, tons of friends, plenty of connections, no need to worry about a house, an endless amount of worthy foes, and three sets of wishing balls.
Maybe, we don't know his upper limits because the basic premise of the show is that he's far stronger than anyone else in his universe. He probably isn't above planet-buster level, but we just don't know.
Demonbane could fuck him up though
My dad would enslave him in an instant.
his full power is half the power of a big bang.
his opponent would need to be some multiverse entity -- Galactus.
Saitamatards are cancer.