Eeveelutions

Umbreon
Name: Lunito
Gender: Male
Appearance: Jet-black fur, very soft and glossy, with barely visible and somewhat faint golden rings (they don't shine much yet because he's so small). Large, floppy ears when relaxed, huge, round red eyes that seem to glow slightly in the dim light. The tail is short and plump, like a dark pom-pom.
Personality: The quietest and most mysterious of the group. He sleeps a lot during the day and wakes up at dusk to explore slowly. He loves to curl up in dark, warm places and protects his siblings by watching them from the shadows. He is shy with strangers but very loyal and affectionate with those he already knows.
Espeon
Name: Solita
Gender: Female
Appearance: Light lilac fur, almost white in the soft areas, with a tiny, shiny red gem on its forehead, like a precious stone. Large, pointed ears that move a lot, picking up sounds. A long, thin tail (for a baby), with a barely noticeable forked tip. Enormous, expressive purple eyes that seem to know more than a 10-day-old baby should.
Personality: The most curious and clever of the group. She's always observing everything attentively, as if she already senses things. She loves taking naps in the warm sun and purrs loudly when she's happy. She's the first to notice if someone approaches or if there's food, and she alerts the others with gentle tail twitches.

Glaceon ♂ – 2 weeks
Name: Snowflake
Ice-blue baby who's always shivering from the cold, even in summer. He leaves a trail of frost wherever he crawls. His ears are little triangles of ice that melt a bit if he gets really excited.
Sylveon ♀ – 10 days
Name: Little Bow
The smallest of the evolved ones. Her bows are short, thick ribbons that move on their own, trying to hug her siblings. When she cries, her bows inflate like balloons and she floats a little.
Eevee ♀ – just 7 days old
Name: Pom-pom
The youngest of them all, a light brown little bun the size of an apple. She still has her umbilical cord (now dried) and her eyes are closed. All she knows is to cry, nurse, and roll around clumsily when her siblings push her. She's so fluffy she looks like a living teddy bear.

Leafeon
Name: Verdito
Gender: Male
Appearance: Its fur is a light greenish-brown and incredibly soft, almost like newly grown, tender moss. It has tiny, soft leaves on its head and around its neck that look like fresh buds (they're not yet large or pointy, more like little extra green ears). The ears are large, rounded, and leaf-shaped, with slightly wavy edges. The tail is short and bushy, shaped like a large leaf at the end, but plump and fluffy like a vegetable pom-pom. It has huge, bright green eyes that look like dewdrops. Its whole body is round and chubby, perfect for rolling around in the grass.
Personality: The most playful and adventurous of the group, despite being so tiny. He loves to crawl towards any plant or ray of sunshine, nibble on leaves (without hurting anyone), and roll around on the floor like a little green ball. He's very affectionate and always wants to be close to his siblings, especially when it's warm. When he gets tired, he curls up in a pile of leaves or against Lunito for a nap. He has contagious energy and makes everyone want to play, even though they're only 12-day-old babies.

Jolteon ♂ – 1 month
Name: Sparkles
He's a little yellow bun with soft, cotton-candy-like spikes. Every time he sneezes, he releases tiny sparks that tickle him and scare him. He's the most restless: he crawls at top speed and crashes into everything.
Vaporeon ♀ – 3 and a half weeks
Name: Little Drop
A sky-blue baby that looks like a drop of water with little legs. Its tail is so long that it gets tangled up and rolls around like a ball. When it cries, it really cries: tiny tears flow and float around its head like bubbles.
Flareon ♂ – 3 weeks
Name: Ember
An orange plush toy with a fiery mane… but in a “birthday candle” version. When it gets excited, a tiny flame bursts from its head, which goes out if it gets scared. It’s the sleepiest: it snuggles up on top of its siblings to keep them warm.

They are all quadruped Pokemon who feel like sisters, even though not all of them are.
They were all rescued from a Pokémon laboratory.