Meenah Peixes

Meenah is a seadweller troll wearing dark grey pants and a black shirt, similar to Terezi's clothes. The shirt has a tyrian purple Pisces symbol. She also has tyrian purple and white sneakers, gold bracelets with what appear to be tyrian purple gems, colored glasses, and gold piercings on her left eyebrow. She wields a yellow trident as her weapon. Her hair is a pair of long, thin braids that trail on the ground behind her. She almost certainly has tyrian colored blood. Her horns are identical to Feferi Peixes and she uses Feferi's Typing Quirk, though only on capital letters.

Initially she is seen grinning menacingly at Roxy. She subsequently appears behind Roxy when she turns to face her (much like Dirk Strider and Bro), and chokes her with her 2x3dent, snapping HS 6543 (COUNT SOM-E WOOLB-EASTS BITC). This references HS 3192 (this scene) from the Midnight Crew Intermission.

Roxy then proceeds to HS 6554 (PUNCH HER IN THE FACE) before absconding, which is possibly a reference to her previous desire to punch the Batterwitch.

She also appeared very briefly in HS 6565 ([S] Jane: Enter)

On HS 6651 (this page) it is revealed that her name is Meenah in the Dialoglog. She appears to have knowledge of the game, at least in reference to the god tiers.

Speculation
Meenah, much like the Scorpio troll, may be the pre-Scratch Condesce, but has slight elements, mainly in hairstyle, of the Handmaid. She appears among the flashing pictures at the end of HS 6565 (this) flash, while the Condesce and things related to her are shown, further strengthening this possibility.