An MLP AU? In this day and age? It's more likely than you think.
I also drew a version with the academy uniform and started on Viktor, but I ended up overwhelmed by the work, so, here's Just Jayce. Thoughts below, and stuff.
Jayce "Forged-Future" of House Talis
Mule with historic unicorn ancestry on his maternal side, which effects a lot when he started screwing around with raw magic and his X gene starts bit-flipping his alleles.
They get a personal name, a ceremonial name which is used unless you're friends, and a house name here, yay.
Bay with a minimal amount of tobiano expression. E/_ | A/_ | TO/n are his exact genetics, but that doesn't matter because:
Completely sterile due to his donkey/horse heritage, which he is debatably a result of procreation tourism of. I have 5k of world building for this, no I will not get into it now.
Talent-Marked after undiluted exposure to the arcane in the mountains. Talent-Mark form directly granted from Mage-Viktor, who only effected its creation form because he knows adult Jayce's talent-mark, which is only what it is because—you get the point: Jayvik Bootstap Paradox.
Chionophobic, as a treat.
Self-conscious about his ears. I'm sure he will do nothing drastic to them in about *checks watch* seven years.
Name and mark from @ / doe-drawz bc finding her mlp arcane art sent me on this spiral lmao.