I have made a ponysona 4 myself, but I’ve never been able 2 put together a good story 4 myself. Hopefully this is good enough:

Alicorn--yet mind has been wiped. Nothing, not even his own name was left.
In his 20s.
Very large--think Trouble Shoes. https://img00.deviantart.net/fd71/i.....rt-d8rxeqy.png Only heavier.
Coloring is here. http://www.furaffinity.net/view/25201244/
Shy about all da looks he gets as a male alicorn, he wears coats/cloaks or robes, masking his wings.
Physically weak, but can take a beating and keep on going.
Like Pinky, tends 2 seemingly pull stuff from nowhere...mostly food items, like baked goods or candy.
Gave Twilight her new nickname: Sparky. ( Twilight SPARKle, 😆).
Bit of a softy, hugging and giving kisses on cheeks and noses.
Major insomniac. (Sona + rl)