For years my daughter, Annabelle, has been dressing up as her favorite characters from Japanese animation and web comics. The term for this pastime is Cosplay. I've posted some of her greatest hits. Here is a link to the a more complete collection, on Annabelle's Tumblr site.
Her friend, Miranda Bates is her usual companion for photo shoots, Cons (conventions) and costume making.
The characters with orange horns are from the web comic, Homestuck.
Don't ask me the names of all the characters.
I felt a little sleazy doing the photo shoot above, but she said this exemplified the personality of her character. The things moms do.