Looking for something like Flashman

I’m looking for anything that’s similar to the Flashman series by George Macdonald Frasier, in the sense that the main characters is an asshole, not a good person, but also not a simplistic character, Flashman felt like a reaaal person, it was like someone wrote a book about a bad guy instead of a good guy, I thought that was a really neat trick to be able to pull off, the only other series that reminds me of Flashman is the Parker series by Richard Stark, that guy is also amoral. Does anybody know of anything else that fits this mold, of a series of books written about a bad person who is actually bad, not you know pseudobad?

Thanks.

by Brocclatees