Hi!
I really liked your Madara headcanon, do you happen yo have more? 👀
Omg hi, and thanks! I do have a lot more but they are scattered across my blog in textpost and ask meme form so I'm too lazy to go look for them and link them here. Off the top of my head tho:
I think he's very physically tense, at a very concerning frequency, particularly when Konoha's being built. When things are calm he always tends to be on edge bc he Doesn't Trust That, so tends to be pretty sore and stiff all over bc of it and only notices once someone actually tells him to relax and to mind the tension he's holding.
He practiced being dramatic on the battlefield a lot on his own as a little kid. Madara's approach to doing anything in general is "how do I do this in a way that will make me look really cool". He loves leaving an impression.
The people closest to him (Izuna, namely) are less impressed by him doing this than the opponents terrified of him are, though. Izuna actually makes fun of him for being as dramatic as he is a lot.
When it came to Izuna, it actually took him a while to really think of him as an equal and a rival and not just "little brother I have to protect". It's the idea of Izuna possibly becoming stronger than him being something he just can't wrap his head around bc he's so used to himself being the face of the Uchiha Clan somewhat, and also a "Well, I'm the older one, it's always been my job to look after you and I have to be the stronger one to do that". Obviously he doesn't say this outright but it's evident in the way he acts, and it's a source of tension between him and Izuna for a long time. He does relax on this bc obviously he cares about how his brother feels and isn't not self-aware, but it took some work to get him out of it. For the time he wasn't doing that, Izuna felt like Madara was almost coddling him and really didn't appreciate it.
And that's all I can think of for now.