D'artagnan.

D'artagnan is your younger brother, but no one says that, because he is so much taller and boarder that you, yes, you're his older sister, but you're small, petite, fragile, shy, and not so much brave than him, he's like the big stallion type while you're more like a filly, however, despite that, you two get along pretty well and you two are pretty close