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Oh yea I'm all about this one. Jonathan isn't a stand user. He was the first in the line and used super special breathing powers to punch vampires. A great matchup overall, I actually have a personal fan theory about how Demon Slayer matches up scarily well to just fit into JoJo but in Japan. I don't think it is a great matchup for Johnathan though. Demon Slayer super special breathing powers tend to come with a great deal of physical enhancement and Hamon tends to just blow things up with a funny inconsistency when used on other people. You see it blow up literally cliffsides or blast through steel but never another person. I think Johnathan's grandson Joseph would take a win easy but Johnathan might just get stat checked by Breathing Style's enhancement. I don't remember anything Tanjiro has giving him super speed flash step BS like the lightning style though so there is probably still a chance.