In the El-Rom AU Discord had 3 children. One from a fling he had with Queen Celestia that produced Princess Solaire Ethereal or Effie as she's affectionately called. The other two others he had with his wife Rarity and are Chiaroscuro Eris Belle and Misanthropy Loki Belle
I thought for fun I'd draw all of them in their true forms.
They are all long and noodle-like with Misanthropy being the only one who drastically alters his appearance. In fact, Mister's form changes a lot with only the white skull-like carapace remaining the same. His favour hobbies include scaring children, flirting with anything that moves and pissing off Effie by having the audacity to exist. Effie's new design is a little different but her overall personality is the same. She's a bit stuffy and grumpy with a heart of gold. The favourite child is Chihiro. Her magic is slowly driving her insane but she's having a fun time right now with her current level of insanity!