By the way, I think we should distinguish between B-List rappers whose legacy is guest appearances in nationally popular groups and those whose career was merely limited to the local scene.
My top 5 locals only?
(1) Scarface: Yeah. This dude is BAD! But really, outside of Houston and LA never caught on. Should. THIS is still perhaps
the single best rap song ever released. Cadence. Substance. Delivery. Beats. Samples. What more do we need?
(2) DJ Quik: While Quik did get some national attention, realistically he was more like a traditional B-List supporting rapper who made a career rapping on other peoples' tracks BUT in LA dude is definitely a certified veteran legend.
(3) The Grouch: This dude was the antithesis to Eminem, he was a white rapper that surprised everybody. A Yay Area staple that didn't translate well out of the underground scene. Even in LA folks be like, "Who?"
(4) Silkk the Shocker: I also really loved Silkk, but this dude really didn't get big beyond the New Orleans area, even when No Limit was at its 1999 peak. Still, a solid and very original a rapper, and whose solo releases were actually better than his guest appearances.
(5) Twista: While for a brief window it appeared that Twista might jump on Death Row bandwagon and catch fame, he came a few years too late, especially as The Chronic 2001 essentially destroyed Death Row's attempt at an early 2000s revival. Twista was big in Chi-town though, and the dude had a lot of unique skills and an original persona. I personally was digging it.