Honestly, I don't see this part having any sort of single main villain, and maybe something more along the lines of a organization, or the fruit itself. Like idk what exactly, but I just don't see a main villain appearing when the story is just like ~20 chaps away from completion (or at least somewhere near that count.)
Anyway! Damn, I hear people saying how this Tooru is soo gonna be evil, but I'm just not with it. I didn't like how he was flirting with Yasuho, but I kinda like him. He just seems so harmless. Of course there's already so much evidence pointing to him being an enemy stand user already, but I just... hope that isn't so lol. And damn, did Josuke forget that Yasuho basically gave him his first name? He just kinda took on the Higashikata's last name.