Second Tsuchikage Mū!
The instant he saw the enemy, Minato identified him. Back when the ancestral graves of the major ninja villages had been dug up, Third Tsuchikage Ōnoki had submitted Mū's information to the Allied Forces headquarters.
In his youth, Mū had fought Hozuki Gengetsu and suffered burns across his entire body from Jōki Bōi. That was why he was wrapped head to toe in bandages. Such a conspicuous appearance made him easy to identify.
Minato ran through the intelligence on Mū. Mū was a ninjutsu-type ninja who possessed Dust Release, a Kekkei Tōta surpassing Kekkei Genkai. He excelled at concealing himself and sensing his opponents' chakra movements, and he was also one of the rare ninjas capable of flight.
"Fourth Hokage Minato Namikaze, one of the Nine-Tails Jinchuriki, and a user of Space-Time Ninjutsu. Choosing you as a target is somewhat unwise. Could you hand the other Nine-Tails Jinchuriki over to me?" Mū did not beat around the bush and directly stated that he had come for the tailed beast.
Minato's expression did not change. He even smiled. He and Mū were not from the same generation. Since Mū had recognized him and called out his name at first sight, he had clearly read Minato's files and understood his relationship with Naruto. Asking a father to hand over his son to die—either Mū was brain-dead, or he was deliberately trying to provoke him. Either way, there was no need to get angry.
"An outstanding junior. It would have been nice if you were a ninja of Iwagakure!" Mū nodded. Just as the files had described, Minato was calm and rational, a troublesome enemy.
"Thank you for your praise, Lord Tsuchikage. I have long heard of your reputation as a Tactician. Under normal circumstances, I would certainly ask you