Congratulations on your big news,
Christina! Wow, you sure do have your hands full (and then some). I'm not familiar with that lion character, but I'm sure War'n'peace will be adorable. My son has decided to be Luke Skywalker (from A New Hope) for Halloween, because he has the perfect hair for it and we can piece together an outfit from clothes already in his wardrobe. Correction: That's why *I* suggested the costume. He agreed because he doesn't want to get his hair cut. (Yes, his stubborn procrastination streak comes from his mother; why do you ask?)
My daughter is nine so slowly losing interest in dressing up. She was going to go with her usual themed witch costume, but now seems to be leaning towards a Moaning Myrtal (from Harry Potter) costume, despite Hermione fitting her personality better.