User blog comment:IamJakuhoRaikoben/Chapter 431 & 432: My sword is... & Brair in Love, Review./@comment-24536822-20150428165710/@comment-23887466-20150428212139

Well the interesting part is Wendy's hair becoming pink, I mean the human Grandeeney has pink hair. It looks like the dragon slayer magic is simply the foster parent giving a piece from his soul to his foster son, and by time the son will become like the father, well they prevented that with their dragonification antibodies.