When setting up your character on the dating show, you sometimes can get a special matchmaker that offers you a partner, it looks like a blob wearing a floaty ring around its waist.
When I got this, the character she offered me for my mametchi to marry was a blob with what looked like fancy fairy wings, but once they married and both evolved, she looked like the blob with the floaty ring lol.
This is all I know because it is all I have seen so far. After they married they had the baby and it was a girl, it then evolved into a star, then evolved into the moon. The blob with the floaty rings name is Planetchi, the stars name was Houstchi (or something like that) and the moons name is Mikazukitchi. I am waiting for it to evolve now.