Seth Cohen is the last of the great eccentrics. The funny thing is, he doesn't know it. He thinks his behaviour is perfectly normal. He sees himself as a pillar of propriety and a paragon of protocol. Seth has strong views about every topic under the sun. There's not a subject he doesn't know about or a moral point he can't pontificate on. Seth is entitled to be a little arrogant. He knows an awful lot about an awful lot of things. He is well versed, well rehearsed, and deeply immersed in the kind of knowledge that we lesser mortals can only dream of attaining. Thankfully, he is there to shed the light and show the way. This, he does generously and patiently, as befits a person of superior intellect. Seth Cohen is wise, intelligent and (thankfully) oblivious to irony.
Or, at least, that's how Seth Cohen is, at his worst. He can't help it. He's an Aquarian and Aquarians are infamous for their occasional outbursts of pomposity. Happily there is another truly delightful side to him. Seth is as honest as the day is long, as generous as the ocean is deep. This is partly where the eccentricity comes from, for a person with such strong opinions Seth is surprisingly willing to please. he is keen to win friends and influence people. He loves to feel that he belongs. He always wants to be in on the action, part of the scene and one of the gang. Rather like Groucho Marx though, he is never sure that he would want to be part of any club that would a member. He is always on the lookout for some new cause to support, or enterprise to sign up to. You might think that this would make him fickle but actually Seth is exceedingly loyal. He may be forever expanding his horizons but he never forgets his friends and he never reneges on his commitments. This is why, despite the highly idiosyncratic nature of Seth's personality, so many people think the world of him.
Ganked from thetaet, allah_sulu, and kmusser. Not very accurate, is it?