Winner, Quatre Raberba

The friendly, empathetic pilot of the Gundam Sandrock, Quatre is unusually tender-hearted for a Gundam pilot. He is the only son of a wealthy family of space colony builders, with 29 older sisters and a stern pacifist father who disapproves of his going into combat. Though Quatre himself abhors bloodshed, he feels compelled to fight to protect his loved ones.

While Quatre lacks the fighting prowess and ruthlessness of his fellow Gundam pilots, he does have excellent family connections, almost unlimited cash, and a troop of forty loyal underlings at his disposal. His gentle personality quickly wins over his fellow Gundam pilot Trowa Barton, and he eventually becomes the de facto leader of the Gundam pilots.

In Frozen Teardrop

[Spoiler] At some point between 10 and 20 years before MC0021, Quatre somehow acquires another, much younger sister, named Katherine Oud Winner. Along with Trowa Barton, who is working under the alias 'Dokter T', Quatre develops 4 new mobile suits for unknown purposes using his family's resources- Snow White, Warlock, Prometheus, and Scheherazade. [/Spoiler]