Gaster is an Equestrian Changeling from the Changeling Hive of Thorax. Oppressed since he was named after hatching butt-first, he became a bully and one of the worst Changelings under Queen Chrysalis rule, as he was forced to kill his own brothers for being zombified by a powerful parastie themed staff made of a petrifived tape worm Chrysalis wanted to gain in an uncharted swamp, finding hinself exiled after Chrysalis abused him for this and went into Destiny the Changeling's wing, and had since vowed to never follow any leader who is either 'power-hungry or self-entitled', making him a rebellious bully. He has a bit of an insulting attitude on him, and though he is loved and therefore in a true Changeling form, he deals with insecurities of not getting along with any other race by being mean and is often times violent and foreboding. His main target is Ocellus who had been with him for a while and was suggested to be at the same school as her by Pharynx, as all that time he confused her for a male and started developing a crush on her when seeing she was a girl, teasing and embarrassing her every chance he got. Despite this, he has some good inside of him.