I can't think of any who come close.
There are some others I enjoy like early season Dexter, but I can't think of any others.
Yeah they on the same wave length I think, gus had his reasons tho marlo just a weirdo psychopathGustavo Fring.....hardly ever says a word....shows up one day and takes a box cutter to a dudes throat without saying shyt.....
Marlo wasn't evil. He had no personality which made him "unlikeable" but he wasn't any more evil than Avon & Stringer.