Nisu no Meo-Lubrum

The third sister, and the most masculine, grey-haired Lubrum wears a spiked choker. Her ship is the Red Snapper Premier. The closest comparison to her would be Kagariya Momiji, however they do not come off as rivals. Rubrum, an alternate romanization of her name, is a form of rubor, Latin for "blush".

(Source: Wikipedia)