|Appears in:||Fate/Grand Order|
|Japanese VA:||Takuma Terashima|
|Character type:||Servant (Master: Protagonist)|
|Place of Origin:||North America|
Caster's True Name is Thomas Alva Edison (トーマス・アルバ・エジソン, Tōmasu Aruba Ejison?), the King of Inventors (発明王, Hatsumei-Ō?) and lifelong rival and nemesis of Nikola Tesla. Born in the 19th century, he was an American inventor whose vast number of achievements are such that they need not be said. He was one who, rather than coming up with inventions on his own, was "extremely proficient at reconstructing the work of other pioneers into easily proliferated forms." He was extremely dedicated to his work, sleeping only three to four hours per day and otherwise fully exerting himself in work at all times. He held cordial relationships with many other inventors, such as Alexander Graham Bell and Charles Babbage, but his rivalry with Tesla was the one exception.
Due to his unique summoning, Caster's body is different from how he was in life, and his proportions differ from historical records.
Although granted a lion's head due to the summoning, Caster's intellect is undiminished, allowing those familiar with him to realize "ah, this is indeed Edison" after a bit of conversation. He has a very straightforward personality, and it is said there are not many points of caution for the Master when dealing with him as a Servant. He does unconsciously repeat the work habits he had in life, so careful attention is recommended to the Master so as to keep him from sleep deprivation or overwork.
Due to his rivalry in life with Tesla, they will have all relations inevitably break down into a fistfight upon both manifesting as Servants.
Caster would normally be a weaker Servant with parameters and Class Skills ranging from D to E. Despite his considerable renown, he is one of the most recent Heroic Spirits, so his power as a Servant is lacking. For this summoning, all the Presidents of the United States of America throughout history granted him a Mystic Code that "would reinforce the concept of 'Edison'" to compensate for this weakness. All of his abilities of been augmented, making for a strange distribution of his parameters and Class Skills where they are either E or EX, aside from Luck.
pako is the character designer for Thomas Edison.