First of all you are a boy in the dragon family with a younger brother that you have around you all the time

Sanji your younger brother he has some powers to protect himself and his friends also you can be any gender

Nami your sister that has a stick to protect you and herself she has a bright smile too btw you can be any gender

A girl that can sprout out body parts anywhere also she is your sister btw you can be any gender and if your a girl your name is Olivia and if your a boy your name is oliver

Brook a musician that is your brother he covers his eyes with some sunglasses also when he dies he can come back to life when he dies btw you can be any gender

A human version of chopper he is your brother that can protect you also you can be any gender

You are Luffys younger brother but you have any fruit you want even a fruit that doesn't exist also your name is Alex