What should Mitchell be for Halloween?

I can't decide what Mitchell should be for Halloween, so I thought I'd let you guys decide. I found three adorable Halloween costumes (pictures below). I'm going to order in September, so take a look and see which one you like best and then vote in my poll at the top of the website.
Lion- suits Mitchell because he is big and round, and smiley and sweet like the lion in the Wizard of Oz. He may not be the king of the jungle, but he's certainly the king of our household :)

Monkey - Doesn't this little boy even kind of look like Mitchell!!! Monkeys seemed to be Mitchell's favorite animal during our zoo visit, and this costume even comes with a little detachable stuffed monkey that he could play with (see picture). Mitchell may not be wiry and scrappy like the traditional monkey, but he is playful and curious!

I have absolutely no idea what Mitchell would have in common with a Rhino, but I just thought this little costume was adorable! It looks soft, warm and comfy since it almost ALWAYS cold and rainy on Halloween.