Hayner is impulsive and determined, and is always looking for a new adventure. He is bold to the point of recklessness, once even charging Axel unarmed. He gets bored easily during uneventful times, as demonstrated when he constantly pesters his friends to do something during their summer vacation. Hayner is also easily angered/irked, as shown in the very first scene in Twilight Town when he tells Pence, Olette and Roxas about how everyone labeled them thieves for stealing photos.
Source from Wikipeida