As promised, here are shots from the guidebook with growth/care requirements! Sorry for the poor lighting and stuff, I didn't really have a better way to take pics, haha.
Girls:
https://imgur.com/51ix1aN
Boys:
https://imgur.com/aoNy4yU
☆☆☆
Toddlers
Tantotchi/Puchitomatchi: Happiness above 10 points.
Nanahotchi/Mittsubotchi: Happiness below 10 points.
Teens
Haretchi: 0-2 care misses. Happiness above 20 points.
Eritchi: 3-5 care misses. Happiness above 20 points.
Soyofuwatchi: 6 or more care misses. Happiness above 20 points.
Mokokotchi: 0-2 care misses. Happiness below 20 points.
Tororitchi: 3-5 care misses. Happiness below 20 points.
Waamuwaamutchi: 6 or more care misses. Happiness below 20 points.
Female Friends
Lovelitchi: 0-2 care misses.
Memetchi: 3-4 care misses.
Nijifuwatchi: Turn your town into the Sky type.
Flowertchi: 5-6 care misses, OR turn your town into the Flower type.
Momotchi: 7 or more care misses.
Male Friends
Mametchi: 0-2 care misses.
Kuchipatchi: 3-4 care misses, OR turn your town into the Forest type.
Yotsubatchi: Turn your town into the Flower type.
Gozarutchi: 5-6 care misses, OR turn your town into the Japanese type.
Shimagurutchi: 7 or more care misses.
About town types, these can be influenced through to the teen stage by things like living room renovations and items. After that, the town type seems to be determined by what friend your tama grows into.
Anyway, please feel free to use and share this info however you like! Hope it's helpful!