Well, Negan first appears in the series as a major antagonist. He has a very distinct personality. He's confident, often to the point of being cocky. His group, the Saviors, would extort other communities for resources. He uses fear as a tool to control those around him. His actions have a huge impact on the other characters in the show, like Rick and his group.
At first, Winchester was pampered, but her nature was not bad. She was the illegitimate daughter of the Wen Family and was sent to the Wen Family to take over the identity of the Wen Family's daughter. She was a willful young lady, but in the end, she got along well with Wen Heng and liked Wen Siguan. According to this information, it could be said that Winchester was not a bad person.
Well, it depends on your perspective. But generally, Negan is considered bad in the comic because of his cruel and violent actions towards the main characters.
In the comics, Negan is a morally ambiguous figure. He's done a lot of bad things, but there are times when his actions might be seen as necessary for survival in that world. So, it's hard to give a straightforward answer about whether he's good or not.