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Eh, I think that is better worded as "Mean =/= Unenjoyable". To me, a likable character is one who is a nice person with traits found in good people, but an enjoyable character is one is a pleasure to watch in some way (eg: the things they do or say, they have many great or memorable moments, they are properly written characters with good stories, etc.). A mean or evil character cannot be described as "likable", but they can most certainly be described as "enjoyable" when done right (like Bender from Futurama, Bill Cipher from Gravity Falls, and Mr. Burns from The Simpsons). That said, likable and enjoyable are not separate, and SHOULD overlap (after all, how are you supposed to like a show if the characters are both unlikable and unenjoyable?).
Dr House, Tony Stark in some of his moments, Bakugo to name a few.
I think the deal is that they had a way to be charming and while they were jerks, they coculd still backup their behavior with their intellect or skills or just the actors portraying them making them a blast to see.
pacifica northwest(gravity falls)
buttercup(yeah she might be mean,harsh and careless but she still has feelings
most south park cast(i swear cartman isnt the only jerk in the show)
most loud sisters
Zim (Yes, he does have a seemingly strong hatred towards humans, but he also has his moments where he comes off as sympathetic, like the time he was often rejected by Tak.)
Max Goof (He can be a jerk sometimes, but he at least has a good reason to be frustrated with his dad Goofy as he doesn’t want him embarrassing him in public. Despite this, he also shows appreciation towards his dad regardless of what he does to him.)
Daisy Duck (I know she’s not entirely mean, but just because she gets angry with Donald sometimes, it doesn’t mean that she is unlikable. Plus she still loves Donald no matter what he does.)
Minerva Mink (I can understand why some people dislike her, but despite being shallow, there’s some redeeming qualities about her i.e. her being happy to see that Dot was alive.)
Rita the Cat