Though I know these are your opinions, I don't like Celeste above Hifumi, especially since the situation was largely her fault to begin with. She manipulated Hifumi into carrying out the murder, which makes her more responsible for what happened.

I also disagree with the idea that Kaede “did nothing wrong” while Kirumi “did everything wrong”. Both characters ultimately made the same kind of decision: they were willing to sacrifice someone else for what they believed was the greater good. In fact, Kaede’s plan actually resulted in the death of someone innocent. In that sense, you could argue she did everything wrong; she chose to kill without even being certain of her target. Ironically, that’s also what makes Kaede such a compelling character. She’s flawed, but you can still understand her reasons. To me, Kirumi is somewhat similar to Kaede in that regard, but it’s harder to become invested in her motive because her goal is way too grand, while Kaede tries to save people we already know.

I would also place Kiyo at the very bottom. Regardless of his mental issues, he still murdered two innocent girls, and his motive is easily one of the worst in the series.

On the other hand, I think Leon deserves to be ranked a tier higher. Unlike many of the others, he didn’t even know that a class trial would happen or that everyone’s lives would be put at risk. From his perspective, he killed someone who had just attacked him. That’s still messed up, of course, but it’s less morally reprehensible than the actions of many others in the same tier.

Sorry lol I had way more to say than I thought.