Well, I guess one would have to define "traits". If you mean certain human proclivities that makes some people to be stamped with a desire to do evil in some particular area, and be immune to temptation in others, then I would think that is so. And I believe that everyone has an unique and individual character that makes them different from their fellow men. Some cannot pass a poker table without sitting down and giving away their family's security. Others, perhaps a large majority in this day and age, can't walk past a beautiful woman without having certain evil feelings arise. Others can easily extricate themselves from the above, but insist upon a sumptuous meal with plenty of flowing wine, and two pieces of cake every day.
In the long run, God judges us on actions, not proclivities. See St. Paul describing his "thorn" whatever that may be. I also believe that every one's "mix" of characteristics and chance on getting to heaven is fairly assigned, whatever the individual make up, among all men, that is, everyone had an equal chance in the vast sum of things to be judged worthy, no matter what the individual nature and kind of the sin.
If one does not have any problems in one area, due to his individual disdain or lack of motivation, then he can hardly claim a counterbalancing merit, when he caves instantly on a matter that he is weak in. If one is cowardly to the point of never getting in a fight, he can't claim any merit for his failure to resist gluttony.
(I'm sorry, this is Lighthouse)