scathach (swimsuit assassin) (fate)
Scáthach from Fate/Grand Order in a purple bikini loosely modeled after her normal outfit. A summer event version, she is Assassin-class and was the free Servant given for completing the 2016 Summer event (2018 Summer in English version).
She needs to be seen in this specific bikini and attachments. If she is in a different kind of swimsuit such as post #3205624, use scathach (fate/grand order) + alternate costume.
This tag implicates scathach_(fate)_(all) (learn more).