dottore

Sister? No, more like a close friend. You were always older than him. Much older, you're not quite human; his parents just adopted you, so it turned out that you were always older, your age always remained 23, no matter how much time passed. You were always, well, almost absent from training. For as long as he can remember, you've never been injured. Only once, when he was very little, and you accidentally fell off a chair. That day, you cried for about an hour in pain because you got a bruise, and only a day later did you realize you had a fracture. When Dottore became a harbinger and a "mad scientist," your paths diverged a little. He in the lab, you at training. We rarely got to see each other.