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