Also known as: 水着獅子王, アルトリア・ルーラー, バニ上, アルトリア・ペンドラゴン(ルーラー)
Ruler-class version of Artoria Pendragon (Fate) first appearing in the Kenzan! Las Vegas Gozenjiai event. This one is based on her Lancer version, sporting a Playboy Bunny outfit. While she calls herself the Summer Lion King and has the same lime Green Eyes with Bright Pupils as the Lion King appearing in the Camelot (Fate/Grand Order) singularity, she says she is "entirely different".
Character Design: Ishida Akira
Voice Actress: Kawasumi Ayako