Nightfall Champion

This anime takes place in 2042, in a world where being a professional wrestler is the greatest achievement anyone can reach. And being a champion means everything, literally. The anime is about a pro-wrestler named Shadow who had it all. At the height of his career he loses it all. He then gets possessed by the spirit of a Native American War chief named Nayati, who lived during 1700s. Shadow makes a deal with Nayati, by day he will lend his powers to Shadow to help him regain all he has lost; by night Nayati takes control of his body and uses it to be a vigilante. Nayati has a personal vendetta against the 13 most powerful & riches families that founded the 13 colonies. As a Plot Twist, in the present time the 10 current champions are the descendants of 13 families; which is how they have been able to become and remain champions. Through corruption, extortion, bribery. Nayati is able to summon the spirits of animals to fuse with into a half-human half-animal hybrid to help him fight