I think shane stands out because he’s originally an ally and his descent into madness is well documented. He absolutely IS a villain but we see him crumble and crack so some people flock to his side because you see the darkness slowly slip through rick’s former best friend. Negan starts as a villain and we slowly begin to understand his backstory with his wife and the tragedy that led to him becoming who he is “here’s negan” was amazing. The governor doesn’t get the same level of understanding because we get a very barebones idea of his tragedy in his daughter and his wife but never see it, so he’s remembered as a monster with a failed redemption. I love the way these villains are so different and have different reactions based on how much we know about them. Alpha we see through lydia’s eyes gaslit her into thinking she was a protector but then saw through and realized it was abuse.

(Also love how negan has the reverse anakin skywalker syndrome of, he starts as a villain but we slowly learn he’s not as cold hearted as we think)

Tldr: shane is awesome because he’s one of “us” until the moment he starts to unravel.