Board Thread:General Discussion/@comment-33053086-20171108062514/@comment-28288412-20171117135544

Jaune's emblem will not change with his discovery of his semblance.

Given the comment in the V1 commentary about Jaune's first hints of a semblance and the situation it was made in (bright flash after Cardin hit him causing no damage and seemingly causing Cardin himself pain) it is likely a semblance that reflects incoming damage back onto the assailant.