I've been trying to figure out which creature the each member of the trio represents.
Myusca's name has something to do with flies. As in the Lord of the Flies? That title is often associated with the mythological figure of Beelzelbub. Could they be related directly?
Given her voraciousness and hunger in relation to the other succubi, Myusca could be akin to a Locust Swarm sweeping through in how much she eats, especially as shown during her rampage through Finoa in the MGQ collab. It is rather fitting. Locust devour entire crops, and Myusca treats the city as her personal buffet. She even uses farming metaphors during her ending scene. So calling her an locust is an fitting metaphor.
Nemea's name is an obvious reference to the Nemean Lion of Greek Legend. Her shaggy mane in her true form is like that of a lion's, and her playful nature with a touch of sadism is comparable to that of a cat playing with a mouse.
Vinum's nature was a bit harder to pin down till I looked at her wings. They are rougher and scalier on the edges compared to the smoother wings of her sisters. Her tail is notably thicker and larger then the others, and is almost saurian in shape. Her yellow eyes have slits in them, a common trait of reptilian species in reality and fiction.Add her large magical presence, and it seems to me that Vinum is supposed to be like or represent a dragon. It would fit her nature as the eldest and her "seen it all" attitude alongside her sheer power, both what we see and what is implied. Her desire for knowledge, and thus power, could be compared to a dragons desire to hoard. In fact her library could be the equivalent to a Dragon's lair, with books instead of treasure. Dragons also tend to not be social creatures, which further fits with her attitude.
Nemea and Myusca regularly go to town to seduce and pick up guys that they eat later. Locusts attack crops in swarms, and lions hunt in prides so it is fitting that they are both very social. Vinum by contrast seems to prefer to stay inside and mostly goes after those foolhardy enough to fall for the "House is unlocked, lets rob it scheme!" that sets up the game, like a dragon who prefers to stay on their mountain.