John is, as the legendary Commander Spock before him, half-Vulcan. He particularly enjoys correcting the mistakes of others, pointing out logical flaws in arguments, actually says "fascinating" quite often, and rarely shows any signs of human emotion. However, get him behind his drums, and the other half (believed to consist in roughly equal parts of Mugatu, Klingon, Andorian, Gorn, Hazari, Nausicaan, Hirogen and Horta) overpowers the helpless Vulcan side. It is strongly recommended that all non-essential crew members maintain a safe distance from John during performances.