Skyzoo wins this thread I think. high level MC with some good joints but like no one talks about him.
I would classify him as more under the radar. I was thinking more for rappers that people may know, but think of them as wack or not nice. For Skyzoo, he's slept on but people who are aware of him think he's nice for the most part.
I'm more talking about rappers who even the people who are aware of them think they ass or they just have like a negative stigma attached them for not being nice. It could be they dropped a really commercial single that didn't demonstrate their skills or they are considered like "hanger ons" or "weed carriers" of more successful rappers so nobody takes them seriously as MCs. But you have actually went and listened to them and was surprised that they were actually really dope rappers.
Another one for me would be Tray Deee. I always just looked at him as like a goon/muscle, but never really paid him much attention as a rapper, but he's actually a lyricist. lol.