Board Thread:Improvements and Issues/@comment-4930269-20130614003800/@comment-5398287-20130622052732

Just so you know, Engetsu hasn't explicitly been stated to be a fire type. Does it give off the appearance of flames? Yes. But this could just be Reiatsu/Reishi taking the shape of flames. Until we get someone in the manga saying "Isshin his a fire-type Zanpakuto" or a databook which states it is a fire type, it's being left as a melee type.