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Dr. Rockso is a character from Metalocalypse and is self-described "rock and roll clown." He is known for his frequent use of cocaine, excessive lifestyle, and his catchphrase: "I do cocaine!". He admits in "Cleanzo" that not only does he use cocaine, but also huffs paint, uses crystal meth, heroin, pain pills, and OxyContin before stating, "I do it all." Dr. Rockso's real name is Leonard Rockstein; the hyperactive son of a physical therapist. Rockso began his music career as the lead singer of Zazz Blammymatazz, a partying glam-rock band named after the guitarist, Bink Bonk Blammymatazz. The logo of Zazz Blammymatazz is a stylized parody of Van Halen's logo. The band quickly became successful; however, Rockso insisted on being paid in cocaine, and was fired for his violent and erratic behavior. After a short-lived solo career, he began his present life working as a clown for parties.
Rockso talks in a high-pitched voice, which every member of Dethklok except Toki finds irritating. He wears a very tight neon unitard with cutouts that expose almost his entire torso and, in the back, the top of his buttcrack. The rest of his outfit includes a combination cap, long, thick, brightly-colored hair, KISS-like face paint, furry boots, and a spiky red nose. The colors of his clothing and hair change between episodes, but are always gaudy, lucrative, and fluorescent. It is suggested that he is a ephebophile; he was once arrested for having sexual relations with a minor.
Rockso seems to be a parody of various events and persons. According to Brendon Small, Dr. Rockso was supposed to be an amalgam of every kind of front man from the hard-rock era, including Paul Stanley, Axl Rose, and Bret Michaels. Eventually the animators made him resemble David Lee Roth.