Similarities Between Firefly and The OC

I have finally seen the series Firefly, and I have noticed some similarities between it and something else. We all know Mal and Han Solo have a lot in common (for the uninformed: they're both gun-happy space smugglers), but what about comparing another old Fox show--The O.C.? Fans of The O.C. and fans of science fiction don't usually overlap, but since I saw the The Doctor from Star Trek: Voyager in an O.C. cameo, I've realized that all bets are off.

• Nandi/Julie Cooper: This is probably the most direct similarity. Nandi, from the Firefly episode "Heart of Gold," and Julie Cooper, a regular character on the O.C., are both played by the same woman, the lovely Melinda Clarke. Both characters are rather promiscuous (Nandi is literally a whore), yet despite the things they may do wrong (including Julie's constant conniving), they both have some good at heart, and you can't help feeling bad for them. These characteristics are rather more subtle in Julie Cooper.
  
• Tracy/Oliver: Tracy, Mal and Zoe's war buddy from the Firefly episode "The Message," is a cowardly, selfish guy who is willing to indirectly break the lives of the people around him. He clearly shouldn't be trusted, but sweet, sensitive, and so naïve Kaylee starts to like his awkward charm just a bit too much, especially after her fight with her love interest, Simon. Oliver, a character who appears in one arc of The O.C., is a cowardly, selfish guy who is willing to indirectly break the lives of the people around him. He clearly shouldn't be trusted, but sweet, sensitive, and often-naïve Marissa starts to like his awkward charm, and wants to save him and protect him, especially as her love interest, Ryan, constantly protests, causing them to fight. Fortunately, Tracy lasted for far less time than Oliver did; both are utterly detestable. Side note: If I remember correctly, The O.C. had another character like Oliver in the third season, when the show was basically repeating itself and everyone had run out of ideas.
  
• Mal/Ryan: Malcolm Reynolds is the main character of Firefly. Ryan Atwood is the main character of The O.C. Mal likes to punch people. Ryan likes to punch people. Mal loves a high-class girl but the series ends before they realize they should be together. Ryan loves a high-class girl but her life ends before they realize they should just be together (thank goodness--I hated Marissa). Mal has a goofy friend named Wash. Ryan has a goofy friend named Seth. Mal is in a world--really, a galaxy--that rejects him and his crew. Ryan is in a world--really, a city--that rejects him, his manners, and all he knows. They even look similar:

If you can think of any more similarities, add them in a comment!

P.S. The O.C. lasted for multiple seasons, and I wish Firefly had that in common as well. :(