Not only am I a 6' tall hot brunette but I'm also a brilliant scientist and I know Klingon marshal arts and I'm 300 years old and I can drink hard and play cards with the Ferengi and everyone is madly in love with me and... and...
Worf was originally going to be a minor reoccuring character but Michael Dorn's performance was so strong they made him a regular right off the bet. Between 7 seasons in TNG and 4 in DS9 he's appeared in more Star Trek episodes than anyone else.