now this is a creative Author with his own plans instead of following the damn cannon of the story or acting wild for no reason. MC is smart and his moves have hiden motives even we might not see in an instant. keep up the good work my man and keep mc badass.
isn't it possible for him to create vibrating blade like structure kinda looking like wolverine or he could put vibration into swords to make them stronger and just like the flash eventually he could walk through walls vibrating his molecules at an atomic level, allowing him to pass through solid objects he could also become invisible eventually if your looking for new abilities for the MC heres a website:
https://powerlisting.fandom.com/wiki/Vibration_Manipulation or just look up Vibration Manipulation and it should be the first one
Rk6T