they're ALL friends (except Sausage and Joey but we'll get to that) but "friends" is like who they're closest to

Jimmy:

Species: Cod hybrid
Eye Color: Olive green, streaks of brown
Elytra: Either slime wings (do not question) or thin metal supports with green webbing between them.
Pets: Cod, baby slimes

Siblings: Lizzie
Friends: Pixl (Coppercod my beloved), Scott (FLOWER HUSBANDS SCREEEEEEEEE), Lizzie ofc.

Katherine:

Species: Fairy, wood elf, or human depending on my mood and/or the AU.
Eyes: Has a special thing that I made up where her eyes change color depending on what color I want them to be (author magic :sparkles:)
Elytra: Bee/fairy type wings.
Pets: Bees

Siblings: None
Friends: Shelby, Gem

Lizzie:

Species: She's not exactly a mermaid- she's like the people from Luca where she turns into a fish in the water except she's purple and exceptionally frilly and fancy.
Eyes: Pink
Elytra: The supports are made of coral block, crushed together. The webbing is woven fan coral.
Pets: Axolotls, fish

Siblings: Jimmy
Friends: Jimmy (obvs), Joel.

Joel:

Species: Straight up human
Eyes: Dark brown, nothing special
Elytra: Traditional elytra because he can't be bothered to change it.
Pets: One horse, some dogs, and a few stray cats.

Siblings: None
Friends: Lizzie

fWhip:

Species: Normal human (mostly) except he's spent way too much time messing with redstone and something will probably happen because of that...
Eyes: Dark gray
Elytra: Heavy-duty dark gray metal supports attached to a harness (it seems very fWhip okay), has red membrane (not metal, not fabric, not plastic, and it's not like Jimmy's membrane or a phantom membrane- I don't know how to describe it. Like... fabric encased in a hard, flexible, not-plastic shell I guess?)
Pets: None

Siblings: Gem, Sausage
Friends: Gem, Shelby

Pearl:

Species: Human
Eyes: Emerald green
Elytra: Giant sunflower petals (yes those are a plant that exist in my headcanon) collected by Pearl and bound together by Gem as a gift.
Pets: Bees, bugs, any animal that wanders into her empire.

Siblings: None
Friends: Gem

Pixlriffs:

Species: Human (or is he..?)
Eyes: Brown
Elytra: Normal elytra with the Pixandria insignia sewn onto them.
Pets: Burrowing owls (I don't care that they don't exist in Minecraft)

Siblings: None
Friends: Jimmy (COPPERCOD)

Shubble:

Species: Gnome
Eyes: Yellow
Elytra: Same as canon (OKAY BUT HER ELYTRA IS FREAKING ADORABLE- LIKE-)
Pets: Direwolves, normal wolves, mooshrooms.

Siblings: None
Friends: Katherine

Gem:

Species: Wizard. (She's not human!)
Eyes: Her iris is looks like an amethyst; it's purple and the edges are jagged and crystalline.
Elytra: Canon
Pets: Gandalf, a baby dragon named Spero, several larger dragons, and a snake-eagle that carries messages for her.

Siblings: Fwhip, Sausage
Friends: Scott, Katherine, Pearl

Scott:

Species: Elf
Eyes: Blue with flecks of gold.
Elytra: Doesn't have elytra, has large feathered wings layered in blue, white, and yellow.
Pets: Snowy owls

Siblings: Xornoth
Friends: Gem, Jimmy

Sausage:

Species: Human
Eyes: Normally they're a very dark brown, usually mistaken for black, but his eyes are red now that he's corrupted.
Elytra: Gray-and-red version of Shelby's - gray near the top and red for the most part - except it's edged with gold. (It also folds naturally into a cape)
Pets: All dead (except poor Bubbles)

Siblings: Gem, Fwhip
Friends: Joey, Xornoth

Joey:

Species: Parrot hybrid
Eyes: Gold, but red since he's been corrupted.
Elytra: He has wings.
Pets: Parrots

Siblings: None
Friends: Sausage, Xornoth

Xornoth:

Species: Elf
Eyes: Used to be a very pretty stormy gray, now red.
Elytra: He can fly. (but before he was corrupted, he had beautiful gray, blue, and yellow wings similar to Scott's)
Pets: Corruption tentacles.

Siblings: Scott
"Friends:" Joey, Sausage

(Additional Note: Xornoth's empire is the Nether)