K6-X4

, also called , is the partner of Mysterious Heroine X Alter in the Servant Universe.
==Profile==
===Background===
Officially designated as Servant AUX Voroid "K6-X4", K6-X4 is a "Servant auxiliary high-performance robot" that was designed for combat and navigation assistance. His body was created from a repurposed head of a rampaging mechanical giant that once turned an entire planet into scorched earth. He became X Alter's trusted partner, and she gave him the nickname of "Dark Knight-kun".
===Appearance===
K6-X4's body is reminiscent of an ancient helm. He has minute Alternium crystals buried with in his head that are synchronized with X Alter.
===Personality===
He has a mean personality and a harsh tongue, described as being unfit to appear in public. He looks down on humans and ignores their orders as a matter of course, only loyal towards X Alter alone.
==Role==
===Fate/Grand Order===
==== Mysterious Heroine X (Alter) Trial Quest ====
The Alterium shard n K6-X4's head receives mana waves leaking through the cracks of multidimensional space. By sheer coincidence, K6-X4's wavelength matches that of Ritsuka. Ritsuka's mind is thereby transferred into the robot, allowing them to experience X Alter's life. X Alter eventually deduces the problem and removes the Alterium shard from his head, thereby returning Ritsuka's mind to their world.
==Abilities==
==Development==
==References==
Category:Servant Universe Inhabitants
Category:Automata, dolls and golems
Category:Characters in Fate/Grand Order (Part 1.5)
Category:Introduced in 2017