Curate, connect, and discover
My reason for calling Overhaul the best Villain in the main series is because he's way more competent, driven and has a real threatening presence to him, compared to the other Villain Leaders.
AFO (Post Kamino) & Shigaraki aren't in his League.
They don't give off that feeling of dread. Shigaraki got AFO quirk to try and make him seem more imposing, but it wasn't enough since having a strong power isn't the only thing Overhaul had going for him.
AFO was decent until after his interrogation with All Might, where he became too comically evil for the sake of it (imo)
Re-Destro wasn't there for long but he did a ok job. The MLA did sell me as a competent group, considering the amount of money and connections they had. As well as their goal of free quirk use.
The only thing that was off was there belief of quirk supremacy, since the organisation's strength came from wealth and connections.
But other than that they were ok, it's too bad they were shoved to the side during the War.
Sorry for rambling
But yeah, that's my reason for Overhaul being the best Villain in MHA
Your reasoning for think that is almost the same as mine.
But also Overhaul ideals and objectives felt different and way more grounded in the sense it doesn't feel like he blames society for everything and his only answer is mindless destruction.
He actually persue change but in way that almost makes sense, and his mindset offers a very interesting perspective about quirks that this series always avoid to exploit. Like is funny how Horikoshi puts constant references to the doomsday theory being something very real, yet no one in verse tries to do something about it and any character who doesn't like quiks is treated as a crazy monster to invalidate their opinions.
Chisaki is also different to other villains in the sense that despite his life is pretty tragic he never gets victimized by the author, something I can appreciate because honestly the most annoying part about the LOV for example is how the story constantly pats them in the back and tries to pretend their are just victims when they passed that point long ago.
Kai on the other hand gets a treatment so harsh that makes me wonder if Horikoshi actually hates him with passion, because holy hell since his defeat Horikoshi really doesn't hold back on try to put him as miserable as possible and with no chance of improve his situation even a bit. It felt like a massive double standard when you see how much the LOV gets glazed.
Well... this kinda became a rant on my part, but I need to express it as Overhaul really deserved a way better treatment because in terms of villains he was the peak and MHA never had something similar again.