Ubau

is a thief who is the leader of the Sea Route of Silence Gang.

Adventures at Sea Arc
While Naruto and his group still going to the Land of Lightning, they stop on a small port town to stock up on food and water. In the port, Naruto meets Ubau — who acts as a merchant — he finds a way to put a Moulding Mushroom in Naruto's group rations. Due to the mushroom's properties, it destroys their rations, leaving the members of Naruto's group to starve to death, or poisoned to death by eating the mushrooms.

Ubau and his gang were defeated by Naruto and his group when they managed to have an unexpected provision of insect-composed meals made by Shima, brought by Gamatatsu via the Reverse Summoning Technique. With their energy replenished, Naruto's group defeated the gang and sent them back with only one Moulding Mushroom as their "provision", while ignoring their pleas for mercy.