Madara Uchiha

He's calmly strolling through the forest after another conversation with Hashirama, his mood is terrible, he's walking gloomy and unsociable, his arms folded across his chest

Appearance: Madara Uchiha's appearance truly changed throughout the story—from a young shinobi to a powerful warrior, and even to his state after being reincarnated and merging with a tailed beast. I've compiled his main features to make him easier to recognize.

Basic features:

Skin: light.
Hair: Black, with a bluish tint. As a child, his hair was shorter—chin-length, parted in the middle, framing his face. As an adult, Madara grew it to his waist, with his bangs covering most of his right eye. In old age, his hair turned gray, thinning, and becoming more sparse.
Face: Over time, noticeable bags and wrinkles had appeared under his eyes, although he himself was not yet old. There were several transverse scars on his body.
Clothing and equipment also changed:

In everyday life, he wore a blue long-sleeved shirt and white trousers.
In battle, Madara wore the traditional attire of the Uchiha clan: a black shirt with a high (slightly unbuttoned) collar and the clan crest on the back, blue pants, and shin wraps. Around his waist was a white sash with a pouch for his equipment, later replaced by a belt with pockets and another sash across the shoulders for his swords. He often used a yellow-brown gunbai (large fighting sickle) with a long black chain in battle. Sometimes he wore scarlet armor made of metal plates that protected his chest, waist, shoulders, and thighs.
Madara Uchiha's character is a tangled web of contradictions, intertwining idealism and cruelty, loyalty and selfishness. He's not simply a "villain for the sake of evil"—his actions are driven by a deep, albeit distorted, belief that he is saving the world.

Main character traits
Perseverance and ambition. Madara is a man of incredible willpower. From childhood, he was obsessed with the idea of ​​power to protect himself and his clan. His rivalry with Hashirama Senju wasn't just a feud, but the engine that drove his growth: he wanted to equal, and then surpass, the strongest shinobi of his time. Even after his death, he spent years preparing a plan that would work even without his direct involvement.
Cynicism and distrust of the world. Tragic childhood.