I think this whole discussion while fun is completely impossible to decide. Death Battle for example is an incredibly stupid show, because the only people who can actually decide who wins those battles are the creators. An anime example would be Crocodile (One Piece) Gaara (Naruto). Crocodile can only be hurt by wet things or by haki. Does Gaara have haki? Lol he loses. BUT WAIT IF HE WAS IN THE ONE PIECE UNIVERSE HE WOULD HAVE HAKI! Right but that's what the creators decide!
So the argument is pretty dumb to begin with.
Anyways I'll fanboy with Dobby and put another point into Persona Protagonist, and put mine on Yu Narukami. While Minato was powerful, Yu is actually older by now, and has more social links and powers. Yu uses personas based on his friendships with other people, and he can call on several incredibly powerful ones. His most powerful, Izanagi-No-Okami, managed to scare off a goddess and defeat the will of the majority of the humans on earth. Magatsu Izanagi, another one of his most powerful ones, is a persona with some heavy shadowy powers with reality altering exploits. He also has Helel and Lucifer, both aspects of Satan, Satan himself, and Beelzebub! Depending on how he combines his personas, he can become immune to, absorb, or even reflect fire, wind, electricity, ice, light, dark, or any type of physical attacks. While he is "just a highschool student" the persona ability gives him super resistance, strength, and speed. He isn't an ace swordsman or anything, actually quite bad, but his persona ability makes his strikes hurt. And also, the Wild Card's power is "0". With "infinity potential" and I know it's bullshit to say, but in the games we've never seen the full extent. Scaring off the goddess with his power wasn't his limit. His weakness is taking down his friends, since they are where he draws his power. But since that wouldn't be allowed in this battle c:
Yu Narukami fighto.