Having a new species that can be playable on station, for those people who enjoy blood related fetishes such as blood sucking. Adding a leech in game would be quite interesting as it could use the mechanic of the iv drips for its ability to suck blood from its.... willing victims.
Sprites can be made to resemble those of a snake however just more fat.
To make a list of interesting things that could be done for this species.
A large fat snake while moving but can also lift up its head.
Ability to suck different kinds of blood for nutrition.
A bit if nightvision as well as immunity to drowning.