|Appears in:||Fate/strange fake|
|Character type:||Servant (Master: Flat Eskardos)|
Berserker is Jack the Ripper, though it is a flawed copy. Jack was already bloodthirsty in life, so his Master believes that attempting to grant him Mad Enhancement in turn made him a relaxed and calm individual. He was summoned with a toy knife as a catalyst.
Berserker has the ability shapeshift into any incarnation of the legend of Jack The Ripper he wants to be, as his real identity was never discovered.