The older-younger sibling roles are reversed for Hashirama, Tobirama, Madara, and Izuna.
[This is the original idea. I'll write a proper blurb later.]
A little absolute rationality paired with absolute power. Since Hashirama is the younger brother, he obeys his older brother Tobirama without question.
A little Hashirama, not yet sure of his ideals, rejected and mocked by the adults, then led by Tobirama to follow in his footsteps and find his own path.
As an older brother, Tobirama feels responsible for his silly little brother and tells him, "Since you're not sure yet, try following me and see if we can make your ideas a reality, Hashirama."
Because of his "lack of experience," Hashirama will obey all of Tobirama's orders. As clan head (yes, I want to see this), Tobirama will give his silly little brother a few rewards. (Tobirama could actually brush him off, but he knows Hashirama's dream has become twisted, so he'll still do a little to reassure him.) This will make Hashirama increasingly convinced that Tobirama is wise, and he'll gradually come to see him as the hope of achieving his dream.
Hashirama lacks life experience and lost his family and friends when he was young. His desire for peace (or for his clan to no longer have to go to war, and so on) will grow stronger and stronger, becoming increasingly twisted. He will serve Tobirama and protect him as if he were protecting his dream. But after a series of events, Hashirama will come to see Tobirama as a prerequisite for achieving his dream. So if both Tobirama and his dream were in danger, Hashirama would choose Tobirama without hesitation. (I just... want to see that kind of twisted dynamic.)
And with the older-younger roles reversed, Izuna/Tobirama and Madara/Tobirama also feel like they could be interesting. Two clever clan heads facing off, with Hashirama and Madara as their enforcers ().
P.S. The idea for reversing the older-younger roles came from the reversed Robins in DC. Both sides are fun to write, but since the brother setup would otherwise be repetitive, I came up with this.
[Update note]
Moving things around has worn down my enthusiasm, so updates will come whenever.
Theme: Just enjoy the ship.
I'm really looking forward to the action of Izuna and Tobirama meeting on the battlefield!
I'm really looking forward to the follow-up. It's hard to find multi-flavored grains these days, so don't let me cheat!
Good year, good year, good year
Is the setting here that all Senju's children inherit immortal bodies? That Thousand Hands Don't Force to Explode the Sky ⊙ω⊙
Nice! Love this setting! Come on, madam!
Your wife writes so well! I'm curious to see what's next for Twisted Repair Dog.
I'm really looking forward to Hashirama's later development.