Who is the god who liked to play mean tricks?

Answer 1

What mythology? Many mythologies have a "trickster god". Coyote, for example, plays this role in many native North American mythologies, though Coyote is usually depicted as more "random" than "mean" and, while he occasionally does bring harm, it's usually as a result of him not thinking about the consequences of his actions as opposed to deliberately trying to be cruel.

Loki in Norse mythology is probably the epitome of the "mean trickster god".