I headcanon Blue as pan.  Like Clay, he likes you no matter your gender.  Cricket was his first crush and he was very confused and kid of scared at first, especially since she was a HiveWing and therefore it would be against rules for them to be canon.

His dream date would be going to a calm and quiet garden.

He would be a good father.  He would always make his children laugh when they're crying and always understand (or at least try to understand) his dragonets.