Board Thread:General Discussion/@comment-174.135.62.244-20160617232120/@comment-25936766-20160710224114

With most people, their Semblances are specifically a reflection of their personality, and exclusive to them, and cannot be inherited (not directly anyway. If your personality is similar enough to both your parents...).

In the Schnees's case, their Semblance is not a reflection of their personality, and it's inherited. It also has at least 2, very different effects, the Glyphs and the Summons, while pretty much all other confirmed Semblances have only been able to do 1 thing.