Meet Royal #191520 - a 15 trait Gen 3 Royal whose unique traits are determined by its block number!

Let's break down how each trait was mathematically derived:

BODY: Its Skelly body appears because the block number is divisible by 16.
HEADGEAR: This Royal wears a Purple-jewelled Crown - the color comes from the second-to-last digit of the block number being 5, while the style is determined by the last digit being 0.
EYES: Its Orange eyes are derived from the fifth-to-last digit of the block number being 2.
NOSE: This Royal has a Skelly nose.
MOUTH: The Cyan mouth is determined by the fourth-to-last digit of the block number being 1.
LOOKING: This Royal is Looking Right, as the last four digits of the block number are less than 3700.
NECK: This Royal has a Black Choker because the block number is divisible by 12 and not divisible by 56. It also has a Silver Chain, as the block number is divisible by 19.
EXTRA: The Diamond Earring is a rare extra trait that appears if the block number string contains "0" and "5".
FACIAL HAIR: This Royal has a Beard, as the block number is divisible by 7 and not divisible by 11.
MOUTH EXTRA: The Cigarette mouth extra appears because the block number contains "3".
EYEWEAR: This Royal has Red Noun Glasses because the block number is divisible by 35 and none of the previous eyewear conditions were met.
SPECIAL TRAITS: Royal #191520 has several rare and unique traits. The Skelly body type, triggered by the block number being divisible by 16, is only found in 602 Royals.  And the rare Diamond Earring extra is present in only 66 Royals.