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First seen by Rou on Day 158 as one of the targets for a meal to gain new abilities.
A male gillman who uses a trident was allied to the Nobles Faction of the Sternbild Kingdom, so Rou preemptively assassinated him while he was swimming in the river that flows through the Royal Capital and ate his body. This Gillman was caught using a brutal tactic similar to fishing with dynamite.
Rou learned the ability【High-Speed Swimming】from eating his corpse.
More Gillman as well as Gillman Knights are seen in the Labyrinth City Aquarium.
Gillmen also live in the Labyrinth City Dur Gha Varia, which is similar to the city of water Venice in real life.