I feel like I'm gonna regret this. Alright look I'm never watched the show. I've only ever read the fanfiction and even then it was all crossover. So domt expect anything good.

Necrotos
"I forget." 'SCREW OFF!'
Male (or female depending on rp)
He has two halves. Like Ying and Yang one is the opposite of the other. The good half is Pure White with with neon green eyes and blood red mane and tail. His horn is that of Chrysalis while his Wings are those of a dragon. His dark half has the Horn of Sombre with Changling wings. His mane and tail are Neon green as well as his zebra stripes while his eyes are blood red. Both have the same Cutie mark. A dragons skull with both blood red and neon green electricity in one eye. The skull is half black and half white looking just like the symbol of Ying and Yang.
His evil half had been in control at first his power neigh infinate. It took the combined might of Discord and the solar diarchs with the elements to seal him away in Tarturas. His dark half did have a secret love. Nightmare Moon.
The Everfree castle.