$48.99
We like Finn, but there are some jobs that he can't handle, like squaring off against the Ice Queen. For jobs like that, Fionna's the girl for the job (partially because Ice Queen only exists in her reality and not Finn's, and partially because she's mathematically awesome). This costume recreates the Adventure Time character perfectly, so all you need to do is find a magical shapeshifting cat to come along with you on your adventures.