About the Akashi Family.
I don't think i ever talked about it on tumblr but your recent post reminded me to share it here too @cemetery14
My theory is that the name Akashi comes from Shiori and not Masaomi.
It's canon the Akashi are old money, a really prestigious and wealthy family. And it's not unusual in Japan for the husband to take his spouse name if she is from a more prestigious family.
If Masaomi comes from a less prestigious family it may explain why he is so hard on Seijūrō, and why he is so strict on the whole 'a man from the Akashi family has to be perfect in everything' thing. He had to prove himself to her family to marry Shiori and to deserve the Akashi name. He has to be perfect in every domain and always come on top.
And now he tries to make sure his own son is also worthy of this name he fought so hard to deserve. He truly believes that's the right things to do for Seijūrō, he just enforce the same standard to his son that he does to himself so he doesn't see how harmful it is, especially for someone so young.
Which also would explain why Shiori is the one with red hair while Masaomi has brown hair. And why Akashi doesn't seems to have any family outside of his parents, they are just as cold and strict as his father even the ones on his mother side.
In Akashi's flashback the colors are washed out so Shiori red hair look redish but it's not 100% sure, but here it's Teiko flashback and she has red hair. Also Fujimaki stated Akashi took more after his mother.
Anyway for me the Akashi name comes from Shiori and i will die on that hill.