Screen presence is very important in acting whether it is television or bigscreen... Sometimes actors may not be excellent in acting but still can pull of roles because of their screen presence.
Coming to ghum, other than Neil and ayesha i always found the actress playing sonali kaku have good screen presence. Infact more than the one playing bhavani and aswani though she have less screen space than other two..
Among youngsters mohit have that and to some extent karishma too..
I'm not saying that others are bad.. but these guys have an extra edge..