Chironex

Kurage is a character in the Yu-Gi-Oh! ZEXAL anime who belongs to the Fearsome Four group.

Abilites
Kurage has the ability to turn into a jellyfish, given that is his true form. In this form, he can use his tentacles in order to poison his targets.

Deck
Semimaru uses a "Jellyfish-themed WATER" Deck, primarily focused on Swarm and Burn tactics, centred around "Number 4: Stealth Kraken the Deadly Poisonous Jellyfish".