Who played Ryan Atwood in 'The O.C.'?

Who played Michael Bluth in 'Arrested Development'? In which TV series is Michael Bluth a main character? Who played Tobias Fünke in 'Arrested Development'? Who played Gob Bluth in 'Arrested Development'? In which TV series is Ryan Atwood a main character? Who played Seth Cohen in 'The O.C.'? Who played Marissa Cooper in 'The O.C.'? Who played Charlie Harper in 'Two and a Half Men'?