Rank: Crewman 2nd Class (PHASE-15)
Age: 17
Birthday: July 20
Blood type: O
Genetic type: Natural
Height: 170 cm

An older student at Kira's technical college in Heliopolis, who is engaged to Flay Allster by parental arrangement. Along with Kira's other friends, Sai escapes the destruction of Heliopolis aboard the Earth Alliance warship Archangel. Unperturbed by the revelation that Kira is a Coordinator, Sai volunteers to support his friend by helping out on the ship's bridge, and is assigned to the Archangel's Combat Information Center as an electronic warfare specialist.

Source: GundamOfficial