Companion?

I love all of the doctor's companions. They all are unique and dramatic (except martha, she's boring). I'm not sure which one I should be. I'm going to use the 4th rp sample provided by Poet.

She stared at the Dalek coming near. She looked around for the doctor. "Doctor!" She called into the dark alley. The Dalek said "Exterminate!" She stared crying heavily. "Oh please no... Doctor! Please help me!" After seeing that he wouldn't come, she stared at the Dalek sternly. She accepted her fate silently, with her eyes closed. A hand grabbed her arm and from a voice she knew she heard a whisper: "Run."

I'm going to have to point you in the direction of Rule #8