Harold (actually Howard in the episode) was a bully in Heroes. He showed he was quick to judgement when he said he believed that Lightning Livingston was a "druggie". Howard was even willing to pick on Jimmy Barclay, because Jmmy had made Lightning his role model. Jimmy got so upset that he fought Howard at Whit's End. When Jimmy finally left to find out the truth, Connie Kendall scolded Howard for doing what he did.
Any family he may have is unknown.