Well my character is very in tune with spirits, though I haven't decided whether or not he's been touched by one quite yet. I don't I'll have him be, though I've no idea how he got his silver hair. xD
I think it should be fine. I don't see anyone arguing. It's already been shown that not just the avatar or his/her offspring can be involved with the spirit world so I don't see any issue. Especially since in the beginning, Yue turned into the moon after she gave the life of it's spirit back and she had no involvement with the avatar. So, yeah, go ahead.