Okay, I just drew it at three a.m. so… It’s really messy. But I once thought that Jack and Tooth would be great airbenders (now that air is the element of freedom).
And then I created Jack’s story. He was at first a reckless airbender that died in some way trying to protect his little sister (nothing different here). And that’s when - for some reason I still didn’t figure out - he was kind of revived by a water force and became a water bender (with white hair and everything). He didn’t remember anything about his past life as an airbender and even though he can bend water, he still has a strange affinity with air, now that every time he gets into real trouble or has strong emotional moments (such as anger) the wind gets strong and “saves” him.