The Ottos are so called because their individual names are all Otto; this applies to both male and female members of the group. The Ottos all speak with Swedish accents, and occasionally use Swedish words rather than English.
Wings-one of a trio of Ottos given nicknames by Ton-Ton after they helped him design a pair of wings so that he could glide; as the creator of the design, he was given the name Wings.
Numbers-another one of Ton-Ton's three Otto friends, she received her nickname due to her mathematical abilities.
The Silent Dude-the third of the Ottos who helped Ton-Ton with his wings. The Silent Dude is so called because he is not very verbose, usually only communicating in grunts; however, he is capable of producing a loud roar.
Mystic Otto-wears a gear around his neck and practices kaflurtihoodigen, trusting in what he feels rather than what he sees.