Madara and Izuna's sibilings:
There isn't enough content about Izuna and Madara's brothers, so I'm making this post to put the link in the description of my fanfictions, you are free to be inspired or copy, as long as you give me the credits (I hardly imagine anyone really liking this enough for this).
Madara is the oldest brother of all, Izuna is the second oldest, the name of their mother is Ryoko (yes, this is important). I vary from fanfiction to fanfiction, sometimes Ryoko is the mother of only Madara or Izuna and their sister, but in modern AUs she is the mother of all of them.
Myokko
The middle sister, her name came from an accident where Izuna, almost two years old, tries to say Ryoko's name but because Madara was nearby, he replaces the "R" with the "M" from Madara. She has an extra "K" in her name just so it's not quite the same as Ryoko's name. Ironically, she is a copy of Taijima in personality, strict with everyone, but like Ryoko, she is very possessive of her brothers and family in general.
Kurome
His name Togashi comes from a theory about Madara's brothers' names that I couldn't find anymore, he's the oldest after Myokko and the fourth son, he's very easy to irritate, exploding with anyone at least 3 times a day, constantly argues with Izuna and often has fights with Myokko in the middle, Madara tries to keep order and is the only one that MAYBE Kurome listens to besides Ryoko, not even Taijima has a chance to calm him down.
Togashi
He is the fifth of the brothers and the youngest, is Kurome's twin brother, and unlike him, very calm and soft-spoken, but when he gets angry he is really scary, he is always trying to calm his twin's fights and often ends up failing (he silently loves the chaos that Kurome causes)
Headcanons
Each one's favorite color is in their name, except for Kurome, whose favorite color is yellow and my tumblr doesn't have the damn yellow. It's the color of their kimonos and their clothes in modern AUs along with black.
They are all nocturnal, but they love sleeping in the sun (like cats).
Out of the 7 days of the week, they sleep in at least the same room for a minimum of 6 days.
They all love braiding each other's hair, even though Kurome has shorter hair.
About their hair, Madara always has loose hair, Izuna has it tied in a ponytail, Myokko ties her hair in high buns, Togashi leaves it in lazy braids, and Kurome usually leaves it loose because it's only shoulder-length (bonus: in Gacha Life 2, where I originally created them, they all have strings tying the front of their hair in their favorite color).
Myokko wears very light makeup, but loves doing her nails, always making complicated and creative designs on her nails and those of people she likes.
Togashi is a mad scientist and Izuna ends up being his lab assistant, jutsus, seals, crazy rituals and anything he sees somewhere he reproduces in the basement under the original basement.
Kurome likes flowers a lot, he preserves them in various forms of techniques and created a book for each of the brothers and cousins he likes where he uses a flower to describe what he likes about each one, their personalities and moods written on top of each pressed flower between the pages, a flower for eye tones and hair color tones, their favorite colors, everything in the language of flowers.
Madara ends up being surprisingly the most open and friendly with people outside the Uchiha clan, even though he is, well... Madara, Myokko looks through the non-Uchihas, Kurome is openly aggressive, Togashi smiles scarily and plans their deaths, Izuna is cold and rude to them, while Madara is just polite (unless someone talks about his clan, or, Kami help them, his brothers).
This is more of a detail than a headcanon, but well, they all have black hair, black eyes, and skin as pale as corpses. Izuna has the longest hair of them all, just below his butt, and he's a little shit about it. Myokko has the second longest hair and is bitter about it; her hair is two handbreadths shorter than his. Madara has the third longest hair, reaching right in the middle of his butt. Togashi has the fourth longest, going to the middle of his back, and Kurome has hers just below her shoulders.
In modern AUs, Madara and Kurome's favorite hero is Batman, Izuna's is Spider-Man, Togashi's is Superman, and Myokko is a fan of Cassandra Cain and Black Widow.
