This is my list of companions for the doctor starting from number 9. And in the mlp universe, I wanted the ninth doctor to have a longer life and more comanions, so yea. Also, this doctor didn't come from the human world, rather was from Gallophrey, not Gallifrey.
9th Doctor: Ditzy Doo (no referece, except slightly less cross eyed and slightly slow minded) Roseluck (She is like the rose tyler, because her name's roseluck.) Clockwork (the Adam Mitchell of mlp) Jack Harkness (same in mlp universe)
10th Doctor: Roseluck Jack Harkness Twilight Velvet (slightly like the sarah jane) Lyra Heartstrings (no reference) Bon Bon " Minuette "
11th Doctor: Twilight Sparkle (like amy, but doesn't get touched by angel) Flash Sentry (like rory, but doen't get touched by angel) River Song (same in mlp universe) Thunderlane (like craig owens) Sunset Shimmer (like clara oswald, except less convoluted)
12th Doctor: Sunset Shimmer Scootaloo (like Courtney woods) Nightmare Moon