|Appears in:||Fate/strange fake|
|Character type:||Servant (Master: Haruri)|
True Berserker's True Name is unknown. It's Master, Haruri, comments that it must hate using the power created by his rival, Nikola Tesla, and theorizes that's it's reason for going berserk before the Contract was even complete.
Berserker appears as a rust-colored robot with spider-like legs and a lion motif. Each step it takes produces harsh, mechanical sounds. Incandescent light blazed in its eyes, and the groans that occasionally emanate from it sound distorted, like a record played with a rusty needle.
Not much has been shown of it's personality, however it has been shown to fly into a rage immediately upon summoning, striking down it's Master before a contract could be made. It is also shown to be terrified of the Einzbern Homunculus who intervenes on Haruri's behalf and forces the contract between the two of them.