Sanson is the brawn side of the team and serves as the Gratan's navigation pilot. Depite his slight yet muscular build, his strength overcomes even the most powerful of mecha. When he was younger he was slimmer and girls made fun of him; as he trained day by day he became stronger but incredibly vain. Sanson also is an outstanding marksman. He was the chauffeur to Granva's family before they lost their fortune, and he remains faithful to her until the end of the series. In the epilogue, he has married a grown-up Marie and they are expecting their first child.

Source: Wikipedia