Well, you can always pitch an idea for a new species, Absol... there are a few ground rules, though.
- They can't resemble humans (this prevents this from becoming some sort of 'vampire drama RP', though there are exceptions in the default species list)
- It can't be possible to make something that looks like your new species using the species that already exist. (this prevents 'it's like X, but stronger!' species)
- You need to give a good description for the species and possible variants without resorting to too many comparisons (this prevents 'it looks like cats! XD' species)
- They can't be too powerful or too large, though this also kind of goes with rule 2, but just remember that having an OP species or character makes things less fun for others
- Use 'typically' not 'always'. This allows for some variance in every species... there are a few times where 'always' could work, try to prevent its use... this is a species, not an individual, and individuals are typically very different from one another.
- Do not post an app for the proposed species until it is accepted. This should be obvious, but I still feel that it should still be said.

Anyways, both Kabling and I will assess the species and either accept or deny it, however, both of us need to accept it before you can use that species in an app.