Since nigh omnis arent omnis, I'll lidt them. Btw these guys eat STTGL for breakfast.
Pre-Retcon Beyonder (millions of times above the entire multiverse of marvel bar TOAA, which contains megaversals to multiversals that eat sttgl for breakfast)
Presence (completely overpowered megaversal+ DC god, only nit omnipotent cuz for some reason he had to absorb GEB)
GEB (Nigh-omnipotent megaversal god)
LoN (created a huge ass megaverse just for fun)
Demonbane (can create infinite universe sized clones, kill you billions of times by looking at you)
Kami tenchi (megaversal, kissed away a multiversal/low megaversal god)
Etc, STTGL barely hits top 10 in anime