Apophis has two forms, anthro and feral. In feral form, he is a large, dark red cobra with with a black underbelly, and wicked eyes that glow dark red. In anthro form, he wears a shendyt and kohl around his eyes.
Apophis has his own ideas of what's fair or not, which causes many problems. He isn't afraid to strike down anyone who opposes him. Apophis can only feel wicked emotions.