1. she change both salvatores and we got to see them.
2. brought damon the cure for the werewolf bite.
3. is just amazing with her looks
4. has a unique style and personality
5. Has great taste in boys. (stefan,damon and maison)
7. WE ALL Liebe HER.
8. turned caroline :)
9. might win stefn over so delena could finally happen ♥
10. makesthe Zeigen just awesome because her and elena look alike along with tatia.
Then theres the flash backsand the past with klaus. withput that past and her hanging herself no originals would be on the show. if katherine had died back then the Zeigen would just be about the Liebe dreieck which is awesome but katherine just makes the show!~imagine no originals oder doppelgangers and rose? that would not be TVD!!!!!!