Explain androids to me?

So, basically I know that you forge them and can scroll/potential their expiring hearts, but got some questions...

-What's the difference between android ranks?
-What look do they come out with? Is it determined by rank? Which ranks holds which looks?
-What's the difference between Android, Deluxe Android, and Princessoid?
-Where do you get Princessoid from?
-Besides NX clothes, can you equip them with regular clothes?
-What's the difference between Iron, Golden, Garnet, and Crystal hearts?
-Which heart is most convenient to forge?

Phew, that's a lot of questions. Thanks for help.

1. Rank determines which heart they can equip. The normal android can equip Beaded, Silver, Iron, Adamantium, and Gold Hearts. Deluxe can equip all of the hearts a normal android can equip as well as Garnet and Crystal. A Princessroid can equip all hearts including Lidium heart, which I don't think is released yet, even though it's in the data.
2. not entirely sure on this.
3. see 1
4. Music Boxes. Fairly rare too.
5. No.
6. Slots. Beaded, Silver, and Iron have 1 slot, Adamantium have 2 slots, etc.
7. Gold. Garnet and Crystal require 4 Superior Crystals each while Gold only requires 4 Advanced Crystals, so it's much cheaper to mass produce.

Also, the princessoid speaks in korean when you click her, the rest of the androids are mute.

Thanks for the replies! So basically I'm between getting a Deluxe or a Princessroid, anyone knows what determines the default looks of each one? Clothes, hair, eyes, etc, and what are the possible ones?

Thanks for the replies! So basically I'm between getting a Deluxe or a Princessroid, anyone knows what determines the default looks of each one? Clothes, hair, eyes, etc, and what are the possible ones?

Princessoids get a random hair not available in the normal options you get at the android stylist.