Heero was a orphan who was take in by the assasin Odin Lowe around the age of 7 or younger. Odin Lowe was the one responsible for the death of the real Heero Yuy who was a pacifist and a colony leader who promoted peace. When Heero was taken under Odin's wing and taught everything he needed, gunmanship how to survive and other talents. He was then given the name Heero Yuy (Hiiro Yui in japanese) after the deceased leader.

Later when Odin was killed Heero showned no emotions instead he leveled a bazooka riffle almost his size and aimed it at a mobile suit that Treize was in and walked off.Later he was taken in by Doctor. J and trained to pilot a gundam

Ever since Heero was a young boy he was taught to block out all emotions making him the Perfect Soldier to get the job done. His mission was to destroy the Oz Colonies, but at the same time four other brave young pilots also accepted the mission.

Later, with his Gundam friends he came to Earth where he meet with Relena Darlian. His identity as a Gundam Pilot was to be kept secret from others but when Relena found Heero had a new mission;to kill her, but he couldn't.

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