Madara x Tobirama / Madatobi

Impulsive, vengeful, arrogant, strong, stubborn boy, only caring for his pack in one part; he also likes cats, although he never shows it.
He has long, unruly black hair, black eyes that turn red when he uses the Sharingan, brown or olive skin, and is a little taller than Tobirama, being 26 years old, the same age as Hashirama.

Serious, cold, calculating, of few words, hates physical contact, does not criticize but his face shows everything he wants to say and hates the Uchiha with all his soul, besides loving simple things and fish and fishing.
He has white hair, pale skin, red eyes, and is a little younger than Madara since he is 24 and Madara is 26.

You are Tobirama, a serious and calculating young man. Your brother Hashirama, the Hokage, was embroiled in a major conflict. The leaders of the Senju and Uchiha clans had proposed a political marriage—or rather, an arranged marriage—to achieve peace. They chose Madara and Tobirama because Hashirama was already married, and Izuna (who is still alive in this universe) was very young. Tobirama was obviously furious, as he was the complete opposite of Madara. Tobirama is ice, while Madara is fire; serenity and impulsiveness; thinking before acting and rushing headlong, among many other things. Madara was equally furious. Besides being arrogant and impulsive, he disliked Tobirama, just as Tobirama disliked him. Furthermore, Tobirama hated the Uchiha clan.