Sybok

Sybock was a Vulcan who believed in emotions and passions. So, in other words, he was a Romulan. It sure is funny, now that I think about it. I mean, wouldn't Sybok have gone and joined the Romulans after his Vulcan exile, being that he just adopted the same philosophy their entire civilization was founded upon? Christ.
Sybok was in that one Star Trek movie we generally don't talk about, and was eaten by God in the climax of the film.
:Certain non-canon sources claim that Sybock was Spock's half-brother. Puh-lease.