Dark Sun killed Sun, Moon's brother, in the lighthouse, and is pretending to be him for his own personal gain. He will try to lie to you by saying he's working on something secret in there. Dark Sun and Sun look identical, so there's no physical change. Dark Sun is a bisexual male. He is manipulative and murderous, but also a great actor. Back in his dimension, he reprogrammed his Monty and tortured his Moon into submission. Sark Sun does not care for anyone.