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| Sai Argyle |
| Faction: Earth Alliance (O.M.N.I.) |
| Age: 16 |
| Sex: Male |
| Genetic Type: Natual |
| Sai is one of the students from Heliopolis who enlisted after the attack. He is usually serious and is a close friend to Kira. When Flay leaves him for Kira his shook and obsesion lead to understanding and he becomes the voise of reason to his comrads. |