User blog comment:Adventuretimegenghiskhan/Is Finn the only human?/@comment-97.104.3.171-20110324050508/@comment-184.96.67.134-20111120204314

fiona is just a story book character that ice king wrote, susan was featured in a later episode were she puts fin's hand in her hat and he makes a face of shock. This could be portrayed in many ways and is probably intended for you to decide upon.