I think it's hard to try and retroactively incorporate new characteristics into an already established character. The only way I've found that this happens realistically is if it organically grows out of the course of roleplay. For instance, my character Icerra, when I first established her was young, belligerent, magic intolerant, rebellious, and impulsive. By the time she died, she was an adamant devotee of Dakkru, an amputee, a cold an emotionless murderer who attempted to permakill her pregnant sister and unborn cubs. Now she's a mere whisp lost in the abyss of the Death Realm. None of that could have ever been foreseeable, I actually originally foresaw her becoming a gladiator of sorts, but that's what the course of RP did to her.
So, I guess my point is, if you have an idea for character growth or direction, don't force it, or it will come off as unnatural. You gotta get in touch with the tao of roleplay and the state of your character, let that guide you in character development.