Luffy is 5'8, a bit short but not that much.

He's muscular and has a devilfruit that makes him rubber. His hair is black, with a small scar under his left eye, with a straw hat onto his head.

He's outgoing, fun, loud, friendly, but is serious in serious situations, which is rare for him. He's really strong, with a bounty over 3 billion.
His crew has 10 members in it, Brook, Sanji, Zoro, Chopper, Robin, Nami, Jinbei, Franky, Usopp, and their leader, Monkey D. Luffy.