Seth is very sarcastic and uses irony to find the humor in the events that occur around him.
He has a positive nature, and although sometimes his humor is misconceived as ill-mannered, he tries to joke his way out of sticky situations and is more likely to laugh off the negatives and be overwhelmingly enthusiastic about the positives in his, and everyone else's, life.
Prior to Ryan's arrival he was routinely bullied by the jocks (namely, the water polo players), who would intentionally urinate on his shoes while Marissa, who lived next door since they were in elementary school, did not speak to him until after Ryan's arrival.
He would go out on his sailboat, the Summer Breeze, to escape Newport; in Season 2 he admitted to Ryan that he sold it for cash while docked at Santa Barbara and caught a Greyhound to Portland.
Urich said his mother died on Christmas Eve, surrounded by her children and family members.