Legendary Stupid Brothers

The are a pair of criminal ninja who originate from an unknown village.

Overview
The two are quite large and almost equally unintelligent (hence their name). The older brother, Fūjin, seems to be more of the leader, as the younger Raijin would follow his orders and ask foolish questions regarding obvious matters, which were responded with equally foolish answers. Their thoughts revolve entirely around food, and the pursuit of it is all that motivates them.

While their intelligence is sub-par, they possess strength so immense that it has been compared to the raw might of Tsunade, who, nevertheless, managed to overpower them with ease. They were able to overwhelm even an experienced jōnin such as Shizune and her entire team.

History
In the past, they had an encounter with Tsunade of the Sannin. Details of this are unknown, but she managed to exercise enough to make them fear her on sight.

During a mission, they killed their comrades for food, then calmed down immediately after doing so. They were locked up in the Konoha Strict Correctional Facility after the incident, though the ones who apprehended them struggled to restrain them. In reality, even the prison was incapable of containing them. It was the guards' control of their food supply that kept them in line. If they are hungry, they will often break through their cell door, threatening the guards if they did not have any food, but will return docile to their cells if given some. They caused trouble for Naruto and Team 10 after being tricked by Mizuki into causing a riot and escaping (having been told that Orochimaru has a feast arranged for them and would provide good food for them every day). They were eventually stopped by Tsunade. Both seemed to recognise her, and were scared into submission by her extreme strength, which was great enough to send even them flying with a single flick. She convinced them to return to the prison by telling them that they would not receive dinner if they didn't return quickly.

Trivia

 * Their names are likely derived from the Shintō gods Fūjin and Raijin, two ogre-like gods of the wind and lightning, respectively.