As for Song and Breach, Song's attire is based on her speed and laziness or recklessness. So, her outfit has to be body fitted but lazy and dirty hence the icky pants. Breach is more, focused on her style since Song doesn't really care about her attire obviously. She likes jewelry so she has golden cuffs and the punk spike choker. It's also good for her speed, her soles are steel heels so it packs a deadly kick. Whenever she going kick someone she usually says "hope you like scars and a concussion b!tch!" Not all gender bends of males need to have breasts sorry Breach
For Mellia and Melanie, Mellia loves technology and robots so her attire is a cream shirt, short overalls and knee length leggings. Her attire is usually stained with oil and musk dirt and she wears a belt to carry her needed tools. She tech cuffs which turns into weapons. As for Melanie, she's more clean and cut. She doesn't like to get dirty so ruin her attire and she ruins your attire face. It's also based off of Miles' attire and she more combat. Melanie perfected the combat fighting style and her being flexible makes it more deadly.
Krystal and O'Kniel, I had a hard time with their names. Krystal's attire is traditional and simple, there isn't allot to pull on when in combat. If ruined, she make can another pair. She isn't too forward in fashion plus she grew up on angel island. O'Kniel isn't as traditional, she grew up somewhere with more civilians so her style is more modern. It's also normal but good in combat, bit big so it's comfy and more room to stretch in.
Hedgehogs are much smaller than foxes and echidnas so Song and Breach are short so that's why Mellia and Melanie are almost as tall as them GOING BY BIOLOGY YEAH