Some are regular D&D creatures! Things like dragons, gnolls, and humanoids of different backgrounds/classes that align to ones used in a lot of fantasy ttrpgs (barbarians, wizards, bards, etc). No official IPs though (named characters used in published games, for one).
Thanks for getting back to me. I am currently making an Rpg and looking for monster artwork for it. I may get this when I start working on the monsters section. Thanks!