I agree with the only exception being if the villain proposed is a one-shot such as Werthrent or Bill the Elder

It's also a good thing we didn't get Dabi to PE too before the recent fight

I mean he didn’t show redeeming qualities during the fight.

@Romeo and Robot True, but he did get more parts added to his backstory that made it more sympathetic, and his defeat so far can also be considered by some to be rather sympathetic

Eh sure. That’s pricesly why we’re waiting until AFO’s arc ends. You never know.

Also, another character in an ongoing series who I could potentially see in the future getting redeeming qualities is Akainu.

We still don't know about his past or reasoning for sparing Aokiji.

I kinda agree with what you just brought up, then again, with Dabi’s arc somewhat ongoing. Is his defeat considered sympathetic even after Shoto called him out.