User blog comment:B214/Volume 23 discussion blog/@comment-201.19.107.104-20170508231409/@comment-30048084-20170509194114

An Evil God is recorded as such in mythology because of their actions.

Loki killed a God, created Fenrir for the purpose of killing Odin and has performed other acts of malice. He is known as a trickster god.

I guess the requirements for being an evil god is related more towards their actions in their own mythology and the scale of their actions.