with the 4 body parts having different looks, and the upcoming changes to looks thru stats, would seem like:
STR = speed = legs
END = riding time = body
DIS = diggin = head
REC = mating = tail
its possible that not all mating attempts will end in an egg being laid. and receptivity may effect that, or how the egg will have its stats determind.
Quote:
*You cannot register multiple chocobos to call as mounts. Also, it is necessary to re-register a chocobo to take advantage of subsequent growth and development.
taken from POL update notes, is pretty strong evidence that you can still increase a choco's stats after it reaches adulthood, especially since u can only mount adult chocos.
I personally dont believe stats will effect what colour your chocobo is, since stats are mainly controled by how you raise it. personality can potentially help you determin what race your chocobo will be, but i believe its not definative. even when you look at our pets in RL, certain breeds of animals tend to have certain personalities, but its not definative. you can have your friendly pit-bulls, or your agressive golden retrievers. we are all still speculating and arnt quite sure how personality is determind, whether its thru our actions or based off other things. i could also be way off myself.