Fujin is a ninja who is in jail. He is very powerful, and his village is unknown.[1]
Sypnosis
When we first see Fujin in the Mizuki's Revenge arc, he is in a prison cell with his brother Raijin and Mizuki. He, like his brother, is very hungry. Mizuki gives him some food, and then Mizuki says that he knows a guy with alot of food. They escape, and take out the guards in their way.[2]
We see him fighting Naruto, and he proves to be a tough match. The Ino-Shika-Cho (Ino, Shikamaru, and Choji) step in to help, but even they can't hold on. Tsunade steps in and commands Fujin and Raijin to go back to jail. Tsunade threatined to not give them any food if they didn't.[3]
Abilities
He is very strong and durable, blocking a Naruto Uzumaki Barrage and defeating two Jonin and two Special Jonin that were in his way. He packs a punch too.