Garret is one of the vampires who shows up to witness for the Cullens, thus preventing Breaking Dawn from having a climax(Damn it!). He is described as an "adventurer," and seems to be crazy, but we don't know if that qualifies as a talent, or whether it works on Bella(but probably not). He ends up with Kate from the Denali coven by the end of the book. After all, why should anybody end up single in Meyerland?
Why the heck did SMeyer name him after Leif Garrett?