Isaiah was Darth (Dark) Vader this year. He has become Isaiah's new favorite character and many things are Dark Vader themed. Also, we have to say the whole thing - Dark Vader, not just Dark, or Vader, but Dark Vader. Isaiah wants him to be a good guy because Luke Skywalker really needs his dad. Hmmm... I think Isaiah is comparing Darth Vader to his lack of a father in his life, and he is Luke Skywalker. Not sure, but maybe.
Here are some pictures of him in his costume. He is so cute. I'm not prejudiced.
The little girl next to him is the daughter of Amy's friend. She loves Isaiah and I have a picture of her looking up at him with adoring eyes. It is so cute.