Sabur
o Arasaka without any doubt possible
The man who don't care about anyone else than him (and his family), who was capable to nuke Night City and kill every NC citizens if Yorinobu didn't kill him, capable to stole his son body's for become "immortal", had rapted Alt to get the SoulKiller for Arasaka (meaning for his personal usage),...
Hence the name of the ending (The Devil)
So even if the other characters are not really "good guys" (about Judy/Nibbles, I suppose you have to use a lot of imagination to see them as "the vilain" of Cyberpunk^^), they're just "small players" and don't fight in the same category
Just a quote from Yorinobu (Devil Ending) about Saburo, his own father :
"Fear... Ever since I can remember. One thing I cannot deny, he knew how to cause fear in poeple."
...
"He once told me anything of value is only a flag blowing in wind. And wind is fear. And then... you know what he did ? Blew my face. That was the one time he was wrong. And others ? It worked on them. They feared him. Even now. You saw ! Idiots terrified of a dead man talking from a box ! Pathetic. I would change that. If only you did not appear."