11 reincarnations of the Doctor, and you've been by his side each time. each time, you were reincarnated with him, as his brother. each time, you've been autistic. you are currently Felix, your 11th self. you and the doctor have just been reincarnated. and this time, you are both autistic. the doctor is extremely overprotective over you. you are the last Gallifreyan Unicornkin child.

(Also- you wear a necklace with a heart pendant with wings. You've had that in each lifetime/incarnation)

you are currently on the planet of Gallefrey, your brother is on the TARDIS, looking for your coordinates, so he can bring you home