For years, Samuel Watson IV, aka Kansas City rapper krizzkaliko, amassed hordes of fans. But he was probably best known as the second fiddle to his friend and mentor, Tech N9ne. You could say he was one of the most underrated figures in the KC music scene. That appears to be changing. Last year, Watson struck out on his own, leaving Tech’s Strange Music label, the crown jewel of Kansas City hip-hop, after 20 years of creating unique vocal stylings on the hooks of many Tech hits as well as his own music. Next month, Watson will launch his North American tour, with stops from Canada to Florida. And he has branched out beyond music, way beyond, to voicing Netflix cartoons. You can hear him as the anti-hero Dinobot on the Netflix animated series “Transformers: War for Cybertron” and, as of earlier this year, as the voice of Leroy Smith on “Tekken: Bloodline,” based on the popular fighting video game. “I was a counterpart to Tech N9ne. People saw us as a group and a package,” says Watson...