Meet Princess Lacrymaria, or Mari, daughter of Luna and Chrysalis. This isn't a first draft per se, but her design may undergo some tweaks.

She uses any pronouns, but primarily she/her.

She doesn't speak much, but when she does it's mostly in monosyllables or short phrases ("yes", "no", "hm?", "mm", "ah", "don't know", "i see", etc). Mari is almost 100% nocturnal, which is probably for the best since her appearance and presence makes most ponies shudder. She's very tall, taller than Luna but shorter than Chrysalis, and has a habit of soundlessly appearing in rooms next to ponies, making them jump when they notice her.