Note: The reincarnator is not the MC.
Fate x DxD.
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A reincarnated guy with cheat powers spent a thousand years building up strength to save the DxD world from devils, angels, and fallen angels. He saw himself as a hero who'd fix everything wrong with the supernatural world.

He was completely delusional.

After a thousand years of preparation, his own followers betrayed and killed him. Turns out nobody wanted to be saved by an arrogant outsider who treated everyone like NPCs in a game.

Now he's dead, but his leftover power is causing chaos everywhere. 

This is what happens when a reincarnator thinks he knows better than everyone else. Sometimes the biggest threat isn't some ancient evil - it's the idiot who thinks he's the main character.
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Character's IMG