The swimsuit version of Artoria Pendragon, who is an Archer wielding a squirt gun as her weapon. She has three different designs depending on her Ascension level:
Level 1 has her in a white bikini with blue ribbons, and she wears her hair in the French braid style
Level 3 has her hair back in the French braid, but she wears a white-and-black one-piece swimsuit beneath a royal green cape with an orangebowtie, and she wears a crown