Owlzawa, Oldzawa, and Shotazawa for Kouichi's various forms.
Papa Yukimi, due to Miharu calling him "Papa" at one point.
Some people have also started referring to the series as "naberry", and members of the fandom as "naberries".
Lying Creator: Kamatani's official character sheet for Kouichi claimed that he was 14 years old, leading to the Wham Episode effect when his immortality was revealed. Technically it's not a lie because his persona as "Aizawa Kouichi" is 14 years old, but it was intentional misdirection nonetheless.