Oh look, you must be British! Aiden is most like Robbie (hyper-active, leaves the band, the drugs) but Rodney has an Robbie element too - the name change (Robbie apparently prefers 'Bob'). But Rodney is most like Gary (piano playing, song writer who can't dance). Ronon is actually more like Howard (the dancing, the dreads), though Carson IS Mark (the 'cute' one beloved of housewives). John is no way analogous to Jason. He's a bit like Robbie too (inasmuch as he can write songs) but he doesn't really fit any mold. He's just John.

As for remembering the names - they did just have their ten year reunion - and they also told you 'Ne-ever forget where you're coming from, Ne-e-e-ever pretend that it's all real....' *face palm*