Fate/Grand Order character. The swimsuit version of BB, who is still a MoonCancer Servant. Also known as BB Pele or BBhotep.
Her Third Ascension swimsuit is not to be confused with BB (Fate/Extra)'s outfit. Both wear a similar black cape, but BB Extra wears it with a high-waist skirt, while BB Swimsuit MoonCancer wears a white leotard.
This tag implicates bb_(fate) (learn more).