Couldn't find any answers in a quick search, is carbuncle considered DLC? And if he isn't allowed, is there an easy way to uninstall him? I am on PS4 and I am thinking I may have to re-install the game and re-patch it to get him out.

Carbuncle is easy mode only. There are separate leaderboards for easy vs normal mode.

Oh, that explains why he never showed up during my regular plathrough of the game, thanks!