Manda

is the king of snakes and is summoned by Orochimaru. When he is first summoned, he demands 100 human sacrifices, though his tone makes it sound like that is more than usual.

Personality
He is very snobbish and prideful, believing himself superior to everyone, and while he does what Orochimaru asks, it seems to be only because he wants to. When Kabuto attempts to calm him (note that Kabuto calls him "Manda-sama", "Lord Manda" in the dub, again reinforcing the snake's pride) Manda merely tells him to shut up, calling him a "bug". Kabuto at this point says something about Manda betraying them if he finds out that Orochimaru's arms are useless, making a comment about his loyalty. Manda obviously will not be in anything if there is nothing in it for himself, showing his greed. He mentions at some point that he doesn't like being summoned, leaving the impression that Orochimaru doesn't do that often. He doesn't seem to respect Orochimaru at all, even going to the extent of threatening to eat the Sannin when he is angry. When exchanging insults with Gamabunta he once again shows off his pride, as well as his confidence, and some sort of rivalry with Gamabunta. He's very strong and he knows it, threatening to "pop" Gamabunta, (in the original, he said he'd turn him into toad jerky). Gamabunta then repels this by saying that he would make a "snake-skin wallet" from Manda.

Search For Tsunade arc
After Tsunade healed herself from what should have been a fatal attack, all three Sannin decided to use their strongest summons and all three succeed at the same time, with Orochimaru summoning Manda. At first he nagged about the fact that he had been summoned and talks down to Kabuto, who tried to answer for Orochimaru.

However when he was taunted by Gamabunta, Manda was quick to start the fight, only to be tricked by Katsuyu whom he tried to squeeze the slug to death, and he was almost burned to death by a combined attack by Jiraiya and Gamabunta before replacing himself with his shedded skin. After a short battle, where none of the three summons seemed to obtain the upper hand, Manda tricked Gamabunta. He was about to kill him when he was finally disabled and put out of the fight when Tsunade shoved Gamabunta's dagger through his mouth, pinning him to the ground. Manda stated that because of this, he wouldn't be able to eat for a week and told Orochimaru that he'd better be ready to pay the price for this.

Hunt for Uchiha arc
After Sasuke defeated Orochimaru in Part II, he used his Sharingan to control Manda when summoned during a fight with Deidara. The reason Sasuke summoned him was to use him as a shield, in order to save himself from Deidara's suicide attack. Sasuke was gravely injured by the blast, which fatally wounded Manda. Manda spent his last seconds cursing Sasuke. Suigetsu then told Sasuke to be nicer to animals.

Abilities
Manda is very powerful, and able to stand his own against Gamabunta and Katsuyu and had almost killed them both before being disabled (though this is to be expected as Frogs and Slugs are the Snakes' prey). He is extremely fast, as he is quickly able to dodge and disable Katsuyu, and incredibly intelligent. It's also obvious that he's well known, as Gamakichi is afraid of him just because of his gaze. He is also able to shed his skin somewhat like a Replacement jutsu, which is seen during the battle with Gamabunta and Katsuyu, and to move underground.

Trivia

 * According to Suigetsu, Manda was Orochimaru's first pet.