
Mikachu's records indicate that gendered Tamagotchi characters were a new phenomenon that emerged during the Tamagotchis' time on Earth, with no prior existence on the Tamagotchi Planet. She explained that the Osutchi and Mesutchi characters began appearing when pairs of Tamagotchi owners started sharing their pets. As Professor Banzo often grew flustered when discussing love, Mikachu took the lead in studying these developments. Because the original "Tamagotchi HOUSE" device was not suitable for raising an expanding Tamagotchi family, Banzo and Mikachu collaborated to create the "Osutchi HOUSE" and "Mesutchi HOUSE."