Vatn is a new character introduced by Metal Slug Attack. He first appeared in the Extra Ops "Halloween Train".
Vatn is a long-haired man wearing a black coat, a brown shirt, a pair of leather boots, and a white handkerchief hanging within his neck.
He is often known as the Ghost Killer. In the Extra Ops in which he is featured, Vatn is hired by a town to stop a supernatural party, and completes his task.
He and Aswang were once lovers, but their relationship ended when Aswang charmed Vatn to bring her a whole village to feast on. Vatn eventually realized he was manipulated and knowing that he was responsible for harming the village, severely wounded her and vowed to never let anyone suffer again. Due to his old age, he is rather sentimental.
Later on, Agalia would manage to drain some of his blood and transformed him into a vampire against his will, becoming Vatn Ver.Crimson. Most of his attire has been kept, but his hat has gone missing. His equipment has been modified to some degree; the drill attachment on his gun is more vampiric and covers a larger area, the standard bullets have been replaced with bats, and he is now capable of summoning demons to assist him in battle. Despite Agalia's control over him, he occasionally performs inexplicable actions such as disobeying her orders.
In "Halloween Train" he is hired by a local town to stop a supernatural party, completing his task.
Vatn would later be forced to attack Caroline, who had just escaped a Rebel facility with a Sky Jupiter Queen that was filled with energy Agalia was interested in. While he destroyed the machine, Dragunov came and retrieved Caroline. Agalia ordered Vatn to chase after the two, but he refused as they were not of interest.
Vatn later appears in Another Story, in "Ωmegalpha". Like in "Halloween Train", Vatn was hired by a village to investigate ghosts that were connected to Ptolemaios. Vatn goes over his plan with their new partner, the Red Goblin. He launches his attack on the Ptolemaic base with his automated mortars and turrets, causing heavy casualties.
He later reappears with Red and Scotia to search for a legendary samurai on a deserted island.
He would later be hired by Whip to investigate a paranormal party hosted by the undead. During this time he unintentionally charms Caroline and Percier with his words. When he finds Aswang, he easily overpowers and prepares to kill her when Caroline intervenes. His past with Aswang is also revealed in this story. Vatn reluctantly spares Aswang, who immediately flees as morning rises.
Still accompanying the group, he drives a boat to bring them to an island. Eventually they would meet Aileen and helped take down an Emerald Turtle with her pirates. The next morning, Vatn found Aileen sleeping in the sea again, apparently having fell off her ship overnight. Red asked him to slow down so he wouldn't get seasick.
- His appearance and design is based on Van Helsing.
- His appearance is also based on Rikiya Busujima from Zombie Revenge.
- If Vatn is defeated, he will appear to pull out a bomb which will result in his self-destruction.
- He is also called 'Vaphaton in the game's files.
- One of the palettes in the concept art bears a resemblance to Alucard from the anime and manga Hellsing.
- His concept art also shows he uses an M240 Bravo similar to Allen before the large Gatling Gun.
- He is available for purchase at the United Shop in the 5th United Front event.