They are named messenger. age: they would be an adult if they were an actual animal. species: they are a robot rot: you can choose you can choose when they appear they are a machine built by an iterator to survive and carry messages. they can do other things and act like actual slugcats. for this au i will say that they may have traveled to deliver a message to an iterator in the area that has been infected by rot. perhaps they could be around for a single chapter and could be destroyed at the end of it or the beginning of the next chapter. then come back as something similar to hunter long legs. if you want you can look here for more about the character https://scratch.mit.edu/projects/1320187820/