Geeky Otter

A person you know that happens to be a complete fandomaniac, and knows such trivial things about said fandoms, such as that Hermione's patronus is an otter.

Person 1: 'I heard that you liked the Harry Potter series?'
Person 2: 'Well obviously! Did you know that Godric Gryffindor's animagus is a giant squid?'
Person 1: 'Don't be such a Geeky Otter...'