Hate Pong Krell, but it's a different hate. It's the hate by design, where that's how you're supposed to respond to the character. Hating him is what you're meant to do, which means he's a good character.
Just because you don’t like Cyril doesnt mean he’s a bad character, in fact, if he was able to make you dislike him so much that means he’s actually done his job as a compelling character.
In my top list are also Finn and Poe: I liked Finn for the first half of the first sequel - for the remaining two sequels and half, he was reduced at being a "rey, where is rey, only to save rey, it's rey" useless, literally useless, guardian angel. And Poe - in TLJ, Poe single-handedly decimated the Resistance, half in the beginning, almost half in the middle, and some in the end of the episode.
Holdo really went “you should not have hope, just die lol” and then got mad when they said no. And she had a plan the whole time? Like, the writers could’ve just had her just refuse to tell Poe the plan because he’s ignoring orders. But she actively refuses to tell anyone the plan, and then ACTIVELY TELLS THEM TO GIVE UP HOPE. And then we’re supposed to be so proud of her because Leia likes her, and she’s sacrificing herself? Was she just hiding her plan to make her sacrifice look more heroic?
Have you heard of Neeku? He is in Rise of the Resistance, he is Jar Jar dialed up to 11. Also, Syril doesn’t deserve to be on this list. He’s just a guy who tried to bite off more than he could chew and paid the price.
Syril is actually an interesting character with a backstory and consistency. He’s impersonating the righteous who unknowingly cheers for the wrong team.