Writer/actor Rob Nash has lots of fans. No wonder. His one-man shows, including Junior Blues and Senioritis, which ran this year at the Bienvenue Theater, are pure theatrical magic. Built around his teenage years at Houston's own Strake Jesuit high school, the scripts are hysterically funny. But a lot of what makes these fairly simple stories about adolescent troubles so wonderful is that Nash himself plays every single one of the 30-plus characters in his plays. Each character is truly unique and carefully drawn with a subtle nuance that manifests in the curve of Nash's spine, the smirk on his lips and the twist of his wrists. But Nash's real kick-ass accomplishment is that these characters appear on stage together, not in a series of monologues. Nash snaps with astonishing grace and speed from one character to another. They bicker, tango, French-kiss and share bong hits as they stomp their teenage way toward maturity. He never skips a beat. The whole thing is a tour de force of acting, writing and absolute guts.