Update: so I just realized whilst writing the rewrite, I took inspirations from my actual friends from school for their personalities.
And I was today years old when I realize my best friend, let's call him canvas, acts so much like Kuroo whenever he's happy geeking about bio and kenma when he's angry.
My other best friend, let's call her honey, she acts so similar to Yaku that I accidentally put her personality into Yaku.
Now I feel like Akahana or Himura in this situation.