Who said "War is never good, even when it's between me and Mandy."?

This quote is attributed to Billy.

War is never good, even when it's between me and Mandy. - Billy

"War is never good, even when it's between me and Mandy."

Billy War

"I'm a big fan of science!"

"Mandy, wouldn't it be great if we could stay young forever?"

"I love the smell of destruction in the morning!"

"Why does everything have to be so complicated?"

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."