V.K.was originally a Kris from an AU of Deltarune (now known as VesselSwap). This all changed when they were suddenly kicked out of their own AU due to a result of a Hack from the outside player. Thanks to the glitch, the player Soul (which was partly scattered across the multiverse) was partially embedded onto Kris, allowing them to travel though any place and time across the multiverse.
When they returned to their "Native" AU, they discovered that they're replaced by another human, who's also the only one who can see them. There some divide between the two as they try to get some answer from the teen, but they became fast friend when they discovered that they're one of the few to ever see the Dream Knight. Now they hang out with the new human, both in the Native AU of Vessel Swap, and the Dream Multiverse.
Appearance
Both their clothes and body are completely greyscale. They wear gauntlets, sabatons, greaves, and a stripped scarf of their Dark World attire, on top of their standard striped sweater, khakis, and loafers of the Light world. Their sweaters have a top zipper in which they use to access the hole in their chest where their soul used to be.
They always bear their teeth as if they're unable to completely close their lips. They also lack visible eyes, which contributes to their uncanny appearance.
Personality
While they retain their mischief of their time as a normal human, they often masked the bitterness toward their condition with their own optimistic grin and witty snark. However, they’re protective about the Asriels, Toriels, and Asgores, of the multiverse, since they wanted them to have a happy life, but have no control over their fates. They’re open to others, but will lash out when pushed to the limit through insults.
Abilities
Soul Link: Thank to the fact that they share the same soul as the Dream Knight, they're able to to sense and see them throughout the Multiverse; with Arch being able to see them in their native AU.
Door hopping: Hop from one AU to another with a mere thought, by simply going through a door of their choosing. Every so often, they hop through closets just to startle people as a prank; giving them the moniker "Closet Human".
Respawn: When killed or destroyed, they’ll simply respawn at the last door they exit from. If said door were to be absent, then they only respawn at the last AU they visited.
Soul warp: Similar to CORE!Frisk’s hollow eyes, they can transport any fit-able objects to themselves at another space and time through the hole in their chest.
Dark Welder: Can turn Light World items into their Dark World counterpart (like a pencil will become a sword on their command).
Trivia
V.K. originally designed to transport items through their mouth.
Though V.K. can return to their native world of VesselSwap, they're unable to fully manifest there; Only Arch can see them, thanks to the shared soul.
The character was created as a Deltarune counter to CORE!Frisk.
More information can be found in the Undertale OC Wiki
