Please watch this video for preference: [1]
What's the work?
Sonic.EXE: Blood Scream trilogy is a fangame of Sonic.EXE Creepypasta featuring a take where a Demon named Executor behaves like a murderous Sonic.EXE as usual, with Tails, Knuckles, Eggman, Amy, Cream, and Sally saving the world from his terrors, until it changes.
Fall of the Angels is a DLC in which you play as an Executor who commits crimes as usual until his backstory opens. He was a demon X corrupted to perform dirty deeds for the apocalypse and caused the massacre of angels.
Who is the candidate?
Executor is the false main antagonist of the previous two games and the main protagonist of the DLC. It may sound shocking, but I think I may have some counterpoints.
What have he done?
I will focus on the DLC since this is where he passes admirability.
The first cutscene revealed that the true Executor showed remorse for the rage he unleashed on the world, questioning whether it was the right thing.
Another cutscene showed Executor's true self confronting his X persona, defeating X to win his body back, while showing X that he is the influence that has been lingering in his mind to violence and murder, turning him into the way he is. He then decided to fix things as his true self as an act of atonement.
After fusing with Sonic's body, he went after Akrasiel, who tried to use the Uroboros Ring to destroy the old world and create a new one for his selfishness. Akrasiel asked Executor to accept the deal to deliver the other half of the ring, but our demon refused and chose to fight him.
After Akrasiel is defeated, Executor decides to revert the world to what it was and make everyone forget about what happened. Sonic, though, still dislikes Executor for his actions, but our demon instead still showed remorse. He then reunites with his wife, Lira, at the end.
Admirable Standards?
He passed the admirable standards for defeating X and Akrasiel to save the world, restore it to where it was, and even people he killed as Sonic.EXE, which is a lot more than the main cast did, who only saved it from Executor; therefore, he passed the admirable standards the most.
Prevention Severity?
For his heinous crimes, I want to pull The Collector's status as a Pure Good/Inconsistently Heinous part, which is almost the same argument why this is not a prevention.
All his crimes come from his Sonic.EXE sona, which gave him moral agency issues. I mean, he does want to get revenge on those who killed his wife, but according to the first cutscene, his true self has been remorseful for this act for a long time, and therefore atoned for it by overthrowing his Sonic.EXE persona and undoing his own chaos. So yeah, it's X who influenced him for the kill of bloodlust and tried to replace his true self, while Executor, who used to have such rage, was manipulated for all the wrongdoings.
And for screentime of remorse? His true self has been remorseful for such actions for a while, while his evil self is just an extension of X.
What prevents him?
I don't propose him as pure good because of Akrasiel's defeat. Yes, Akrasiel deserved all of it for being a selfish angel, but it got portrayed as brutal despite his lack of pleasure.
Conclusion?
I think this is the right move.