Weird?
Well, he's not as bad as Death's example (in fact, I don't think he's even a yiffer in the sense that he looks at furry porn), but there's this one guy on another forum I'm on that is obsessed with Lugia. He wants to be one, all of his RP characters are some derivative of Lugia (some anthropomorphic, some not). He's obsessed to say the least, especially when he roleplays in the chatroom as a Lugia, but I'm pretty sure he's not a yiffer.
Although this isn't necessarily the creepiest thing I've ever seen, he certainly makes me want to rip his eyeballs out and falcon punch him in the balls.