Favorite Energy Type?
This is another of those questions that feels rooted in WoTC versions of D&D. I don't remember talking about energy types in my first 20 years of D&D gaming.
Still, a challenge is a challenge so I will say my favorite energy type is raw sexual magnetism. I leave it as an exercise to the reader to figure out how to implement that at your gaming table (or if you should). Almost certainly involves Succubi.