Gyokko has mastery over water and the creatures of the sea, but these skills also allow him to essentially teleport through pots and regenerate and transform cells.

Source: https://www.cbr.com/demon-slayer-strongest-weakest-demons/

Gyokko is highly dangerous.

Source: https://www.cbr.com/demon-slayer-strongest-weakest-demons/

Just the way Daki subverted beautiful oirans into deadly predators like herself, Gyokko inverted how octopus traps work and made the jar a trap for people, not for the octopus.

Source: https://www.cbr.com/demon-slayer-gyokko-octopus-attack-explained/

That does not even mention Gyokko as the creepy pot-dwelling demon has shown Muichiro just how powerful he can be when unleashed.

Source: https://comicbook.com/anime/news/demon-slayer-season-3-anime-poster/