Board Thread:Naruto Discussions/@comment-43776375-20190927162335/@comment-9782468-20190927171954

Hiruzen, Hanzo, Minato, Third Raikage, Tobirama, Gai.

Tobirama was considered to be in the same class of his brother, Izuna, and Madara in terms of combat prowess

Hanzo fought all three Sannin together. He then decided he was impressed that they survived as long as they did and just let them live only if they took the title he gave them.

Sakura would be low on this list but she's easily one of the most powerful of the regular people in the series upon adulthood. Not many people would be able to fight a Mangekyo Sharingan wielder 1v1 (to the point where the saying about Uchiha is to flee in a 1v1 scenario), but she did it superbly.

Gai with only 7 Gates is still ridiculously strong.