The self-proclaimed "World's Deadliest Golfer", he was banned from every golf course in the world, even miniature golf, for excessive displays of temper. His weapons are his golf clubs and exploding golf balls. He speaks with a Scottish accent, and wears traditional Scottish attire such as a kilt and tam o' shanter. Although he debuted as an independent villain, subsequent appearances show him as more of a mercenary-style individual, committing robberies to sell the stolen objects to others without any real plan for them himself. Killigan makes his home on a private island, dubbed "Killigan's Island" by Ron (undoubtedly a reference to the "Gilligan's Island" television series).