Riff Raff is practically an urban legend—a bizarre white man with cornrows and an MTV-logo tattoo, a persona that purportedly inspired James Franco’s Spring Breakers performance as rapper “Alien.” See the human cartoon character in the flesh tonight, where he’ll likely rap about Jose Canseco and Dolce & Gabbana. With Grandtheft. The Showbox, 1426 First Ave., 628-3151, showboxpresents.com. 8 p.m. $25. All ages. KELTON SEARS