Caster-class Servant seen in Fate/Grand Order first appearing in the London singularity. A mathematician from 18th century who build the foundation of computer engineering, which leads him to being honored as "Father of the Computers".
In game, he appears as a bulky, steam-powered mecha due to surrounding himself (his soul) in a Reality Marble representing his dream of a steampunk world. Essentially making him a living steam-powered robot.
