|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, covered in pistons, wires and cables. 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. It also appears to possess the capability to change it's appearance, growing large enough to stomp a small prefabricated house flat with ease, sprout cables from it's frame to swipe away projectiles, and even visually hide it's appearance and sound like optical camouflage.
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.
Not much has been shown of True Berserker's abilities, however he has been shown to possess abilities of increasing it's size, absorbing rubble, manipulating the cables to attack or defend, uproot and devour electrical cables for a power source to supplement it's magical energy, and visually hiding it's appearance and sound like optical camouflage.