Those time travelers that year

Basically, it's a story about a warlock who travels around the world and initially doesn't intend to be a guide, but then he turns himself into a madman. That's about it!
P.S.: The world the protagonist travels to is set in anime, games, or movies. If any of you have suggestions on which worlds the protagonist would like to visit, please let us know.
Just don't make it too high at once! Let's skip the extra-standard worlds like Dragon Ball and Doraemon!