Also known as: キャスター(帝都聖杯奇譚), マックスウェルの悪魔
Caster-class Servant in the manga Fate/KOHA-ACE. As a personification of James Clerk Maxwell's thought experiment his abilities allow him to have something resembling infinite mana reserves matching the hypothesis' negation of the Second Law of Thermodynamics.
He is an orange-haired man, wearing black Sunglasses with a tan Suit and red Necktie.
He also appeared in Fate/Grand Order's GUDAGUDA Final Honnouji 2019 event.
Character Design: Keikenchi
Illustrator: Ikezawa Shin