Jaguja partners with Kanna, first appearing in the episode "Jagooja! Kanna to Scratch!". His design draws inspiration from aquatic snakes like sea snakes, with his evolved form reflecting water cobra traits. A distinctive feature includes seven faucets on his back alongside his head, a design element referencing the mythical eight-branched serpent Yamata-no-Orochi.

His name combines the Japanese words "jaguchi" (蛇口), meaning "faucet," and "ja" (蛇), an alternate reading for "snake," potentially interpreted separately as "Snake Mouth." It also functions as a play on the word "Jacuzzi" (ジャグジー, Jagujī).

Jaguja utilizes water-based abilities. His primary techniques are the S-ranked Faucet Stream (ジャグストリーム, Jagu Sutorīmu), the A-ranked Water Gun (ウォーターガン, Wōtā Gan), and the B-ranked Flush in Water (水に流す, Mizu ni nagasu). His evolved form, Barrel Jagooja, employs the enhanced Full Faucet Stream (フル・ジャグストリーム, Furu Jagu Sutorīmu).

In Episode 32, "Dried Jagooja!? Cetuscruise's Trial!," Jaguja accompanies Kanna on a desert quest. Their objective is to seek Cetuscruise, one of the Legendary Seven Mazins sharing their water-controlling abilities, to help awaken Anya. During this trial, they encounter Cetuscruise's disciple, Mazin Drillhino. The episode narrative indicates they must defeat Drillhino to potentially become Cetuscruise's disciples.