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 [i][[koha-ace|Fate/KOHA-ACE]][/i]. As a personification of James Clerk Maxwell's "thought experiment":http://en.wikipedia.org/wiki/Maxwell%27s_Demon, 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_hair|orange-haired]] man, wearing black [[sunglasses]] with a tan [[suit]] and red [[necktie]].
maxwell's demon (fate)