Hirotchi = connect any male teen to 6 or more different friends.
Maisutatchi = connect any male teen to the same friend 30 times or more.
Mametchi = on 3 or more occasions, activate the toilet icon while Hanikamitchi (male teen) is doing the pee-pee wiggle dance, before he messes on the floor.
Kuishinbotchi = feed 20 or more snacks to Bokuhoshitchi (male teen).
Sunopotchi = have Happabouyatchi (male teen) get a perfect score on a mini-game, 20 times or more.
Madonnatchi = connect any female teen to 6 or more different friends.
Giragiratchi = connect any female teen to the same friend 30 times or more.
Lavulitchi = on 3 or more occasions, activate the toilet icon while Painaputchi (female teen) is doing the pee-pee wiggle dance, before she messes on the floor.
Perotchi = feed 20 or more snacks to Sabosabotchi (female teen).
Ponpontchi = have Hineonetchi (female teen) get a perfect score on a mini-game, 20 times or more.
HenshinJo:
Some of the adult characters can be transformed into their special forms. You can change them at HenshinJo's. Below you can see a chart showing which characters can be transformed and what is needed for them to be able to transform.
* Note: items marked as DL are not built-in and have to be transferred to your Tamagotchi via iR.
* Source: Tama-Zone + Carleesi Kawaii