[Androzani84]

I think 80’s bizarre design is part of why he hasn’t been part of any Ultra fusions, in addition to his basic character. Pretty much every fusion combo, be it ultras or monsters/aliens, has some shared in or out of universe similarity between the components (eg. Ultraman and Ultraman Tiga are the first of their respective eras, Ultraman and Belial are the quintessential good and evil Ultras and Zero, Seven and Leo are part of a master-apprentice chain). 80 is the only Ultra to be a teacher, as opposed to a master and his red crest is shared by no Ultras outside of his series.