I've been re-watching season one of Heroes. It seems like almost everyone initially introduced is the offspring of two people with powers. Hiro's mom was a healer, what powers did his dad have?
He has the power of studying a situation and predicting its outcomes, though in the series he never uses this ability.
And in the notes section of heroeswiki
In a deleted scene from Four Months Later, Kaito reveals his "special ability" to Ando. Kaito says he can "see the variables of any situation and predict the outcome." He claims he is faster than a computer and attributes his success in the stock market to this ability. This ability is similar to accelerated probability. In Season Three, this same description is used by Peter to describe Sylar's intuitive aptitude. However, it should also be noted that the deleted scene is not canonical, and Kaito has not been confirmed to have an ability. Of note, Bob said in the episode Four Months Later..., "The Company was formed thirty years ago with a group of like-minded individuals, ordinary men and women who were gifted with extraordinary powers." Kaito was one of these founders. Kaito's Primatech file also listed an ability for him, thought the file was damaged to the point of illegibility.
Hiro's father didn't have any special powers, he was merely a normal person. He was introduced as everyone from The Company, as has been seen in later seasons. See the Hero's Wiki entry on his father.