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Rider's unnamed Master from Fate/Prototype. Sometimes played with a functioning body.

Rider's Master looked like a youth of about 10 years.
He was a Master candidate of the last war, and he was forcefully kept alive through
medical technology and sorcery by a faction of magi that survived the last war.
The youth was a sacrifice who had a beast planted inside him by ????, a living corpse.
His hands and feet had rotted away, and his organs were mechanical. The only living
portion of him was above the breast.

"I do not wish for a tragic hero, but a happy one. Because--the wish of a satisfied man must be a happy one, right? I think your wish upon the Grail will warm people's hearts."