Chiskai 100%. Do people forget he killed and revived Eri hundreds of times?

Yes he 100% Chiskai deserve the worst father of the year award due how bad he treated Eri.

That man is near Shou Tucker levels of bad.

He version of Shou Tucker both of them give their kids fate worse than death.

I don't know, I don't really hate Kai Chisaki and never once I thought of it.

Curious as to why exactly you don’t hate him? He’s a literal child torturer

I really liked characterization and that he did everything for his adopted father. Also his quirk is cool. He was the main reason why I return to watch the anime after playing My Hero's One Justice 2. Also child abuse in storytelling doesn't surprise me anymore just like everything else. It's kinda like the animal cruelty trope where the villain is just cruel for the sake of it and its expected and not really surprising.

True I honestly like his quirk it pretty cool in the anime version of mha.

Personal Ranking. This is just my opinion, so don’t take it as everything:

#1: All For One - Cares literally nothing for Tomura, only sees him as a vessel and tool he designed (emotionally manipulated since he was five) for stealing One For All. He only acted like a father, but didn’t care about Tomura in the slightest, only himself. He also prepared other children to take Tomura’s place had anything happened to him, showing he viewed him as replaceable and was willing to put other kids through the same fate.

Very Close 2nd - Kai Chisaki - Repeatedly tortured and dissected his boss’ granddaughter while treating Eri as a tool rather than a human being. Some may argue he deserves the number one spot because of his sheer cruelty in comparison to AFO, but at least Eri was saved and he’s limited to just her as his victim of child abuse. It’s also why he’s a very close second.

3rd - Kotaro Shimura - The way he treated his son (and presumably his daughter as well) was absolutely awful, but at least he understood he was wrong and admitted he went too far. Sadly he realised this too late. Things might’ve gotten better had Tenko’s Quirk not manifested when it did that night.

4th - Endeavor - The only one of these bastards who took responsibility and made an effort to redeem himself. He took careful efforts to atone, but was honest about it - he admitted to Shoto that he would do his best to become a better man, and not just act like he had changed overnight. Furthermore, when he realises that his family are happier without him, he chooses to buy a new house for them so they can start over without him. He’s now determined to fight and continue to atone so his mistakes won’t burden others.

You got a very good opinion @AnSon828511.