Garaga

is an inhabitant of the Ryūchi Cave, and the personal summon of Boruto Uzumaki.

Background
When he was young, Garaga entered into a summoning contract with a shinobi. In one of their battles, his summoner wanted to retreat, but Garaga wanted to keep on fighting, so the summoner betrayed him, attacking him with Lightning Release, which blinded his right eye. Since then, he became so violent that even the other snakes avoid him, prompting the White Snake Sage to consider him a nuisance.

Personality
Garaga is a very dangerous snake, prone to major violent outbursts. He outright declares his hatred of humans and any who gets in his way, showing a very short-tempered and irritable nature. His dark and aggressive nature stems from the betrayal of his former summoner. From this he believes that trust is a foolish concept, declaring that people only earn others' trust to use them.

Appearance
Garaga is a massive snake. He is coloured red, and has black rings running down intervals on his body. He has a pronounced forehead with a single left eye while the right is scarred over. He also developed a reverse scale, a jewel-like scale under his jaw which is a rare trait only developed by the most aggressive of snakes.

Abilities
Garaga is a massive and powerful snake, able to fend off multiple shinobi and even a fellow giant snake all at once. Due to his size and strength, Garaga can coil himself around his target, immobilising them. He also spits venom that is able to petrify victims moments after contact, an ability which Aoda links to Garaga's reverse scale. He is able to camouflage himself into his surroundings to go unseen. Like many snakes, Garaga is able to detect others by their heat signature even in darkness.

Mitsuki's Disappearance Arc
Garaga attacked Boruto, Sarada, Shikadai, Inojin, and Chōchō when the Konoha genin were requested by the White Snake Sage to take his reverse scale, but was interrupted by Aoda. After his battle against Aoda, he swore to kill any human that comes near him no matter who they are. Ultimately, the genin and Aoda attempted to subdue Garaga long enough to obtain his Reverse Scale, only for Garaga to petrify Chōchō to escape and Aoda left too battered to keep fighting. Garaga returned to his personal feeding grounds. In it, Garaga had the advantage as he could camouflage himself to the surroundings and see his foes in the dark through their heat. Taking advantage of Inojin's drawings having no heat, they were able to distract the snake long enough for Boruto to reach the Reverse Scale. In that moment, Boruto connected with Garaga's mental plane, seeing into his sorrowful past of betrayal from his former summoner.

As the two talked about the value of trust, Boruto insisted that Mitsuki was indeed his friend. Garaga scoffed at such a notion, wishing he could be there to watch Boruto's hopes crushed. Ultimately, Boruto chose not to take the scale. Instead he made a deal; Garaga would enter a summoning contract with him to see Mitsuki himself. Then, if Mitsuki was brought back, Garaga would acknowledge Boruto as his equal, but if Mitsuki did betray Boruto, the snake could eat Boruto. Intrigued by Boruto's determination, Garaga accepted the terms. After Chōchō was restored, they returned to the White Snake Sage. There, Boruto summoned Garaga before her, technically upholding his promise of bringing her the Reverse Scale.

Trivia

 * His name likely comes from, a Japanese soundword for "rattling" that is also found in the name of the.