Apart from Revan and to a lesser extent the Exile, I'd say Malek, Carth, Bastila, Canderous, Atton, Kreia and funnily enough Bao-Dur. The latter doesn't say much but when he talks about the past its kinda...realistic. The best one though is Revan, obviously, despite the whole 'lost my memory and turned out to be the world's greatest villain' clich