Ohh yeah your right .. I forgot about ussop and Yassop ... doh...
However....
I just had a ... stroke of madness or genius i can't tell. Luffy doesn't really resembel any of the women we've encountered thus far. Except maybe the barmaid from his hometown. But there is a woman that closely resemble's his brother, Ace, look closely at Alvida before she eats her subesube no mi, the freckles and her style and even her hair. All of which ace bears a resemblance to. Now if luffy and ace are straight up brothers, that makes alvida his mom. But if they are half brothers like some people suspect then that makes alvida no real relation to luffy.
However that means at some point Dragon slept with alvida... Ewww.... gross.
Then again some guys like fat chicks. Not to be insensitive but theres slightly overweight and then theres is that a chick or a manatee.
Well anyways Just something I thought I'd bring to light.