Wu Geng Ji is anime adaptation of Chinese manhua Feng Shen Ji. The story basically is about humans get enslaved by gods. While most of the humans just willingly accept their wretched fate, some dares to stand up and defy the gods' tyrant rules. It's a great anime - story, I don't read the manhua, though - and youtube is being stupid as usual for blocking it!
Zhui Ri is one of the gods, so that makes him one of the antagonists. Heh, but with that kind of look, who cares whether he's the good guy or the bad guy, right? xp (I always welcome sexy good-looking villains!) Zhui Ri fights using lightning.