[@KawaiiKyouko]You need an actual hero with some sort of history. This girl doesn't have what it takes to be considered a proper Rider. She lacks the historic fame, and power to be a heroic servant. Even if we did consider it she'd be more along the lines of Marie Antoinette. I'm going to have to deny this character.

Rider class should be something along the lines of: Ma Chao, Medusa, Perseus, or Scipio.

If you desire a canon rider you can look here:

http://typemoon.wikia.com/wiki/Rider