In the course of the anime, she learns that her species is Homo Sapiens Sapiens a.k.a. human
She is also, in fact, a "Friend". She came into being when Sandstar came in contact with a hair on what was once Mirai's hat. The fact that she is human comes into play in the fight with the Black Cerulean. By removing the Sandstar from her body, she was supposed to have her human attributes removed and thus stop being a "Friend". The only reason why she survived inside the Black Cerulean is that she is human to begin with. Due to this loophole she seems to still be a Friend, as her "fur" (clothing) is seen regenerating throughout the final episode of the first season.