So we know yasuo to be a true sword master with his amazing yet hard to utilize kit. what about another swordsman for the sword school yasuo went to also with an amazing but difficult kit dealing with an element or force. electricity/ lightning could be an interesting thing to use.
One of the other students who is hunting him? Just seems like it would be hard to differentiate them thematically unless the explanation is that a new master replaced the one believed slain by Yasuo and he trained the students differently from his predecessor. It can't be the slayer of the master, since that guy would be like a clone of Yasuo--The master slain kept the secret of the wind technique which is why he was slain with it. The culprit mastered it and used it to slay the man. Which is why everyone believed Yasuo did it -- he was the only other person in the school to master the wind technique.
It has potential!
