Disgaea 4 Complete+ Tactics with absurd numbers

Valvatorez is a vampire bound by an old promise, working as a Prinny instructor in Hades, when the Corrupternment threatens his charges. So he does what any reasonable former tyrant would: starts a revolution. You gather a ramshackle army of werewolves, angels, failed Final Bosses and worse, and push the story through a Netherworld of political scheming that stays funny almost all the way down. The jokes lean on anime tropes and fourth-wall demolition, but there is a real plot underneath, and it wraps up more neatly than the chaos suggests. Extra story campaigns add even more after the credits.

The level cap is 9,999 and damage can reach into the trillions, but the real game is the schemes you invent to get there. You can build custom maps, dive into items to level them from the inside, reshape characters with skills and passives borrowed from others, and rename your healing items into whatever you like. A cheat shop lets you tune rewards your own way, and speed options up to four times keep animations from slowing the grind. If you want to stop at a solid story campaign, that works too; the deep end is there when you want it.