But does Marin use Left-Handed One Handed Dvorak or Right-Handed One Handed Dvorak? Konoha would obvious use Right-Handed if any, (Because she lost her left arm) but I don't think Marin's ever had any reason to need to use one more than the other, right? So I feel like she would use Left-Handed so that she can keep using her mouse with her right hand.
But also I feel like if she used any alternate layout, she'd use SKY due it being, you know, actually designed for Japanese. Probably with an alt layer or something to type the rest of ASCII as well, because her work probably requires her to program stuff fairly often, which definitely needs the letter L. But also, on the topic of programming maybe she'd use Programmer Dvorak? It is ultimately based on English letter frequency, but maybe she'd be fine with that considering most of her typing is probably coding in the first place?
But anyways, yeah. Marin is either SKY or Programmer Dvorak and Konoha could have learned RH Dvorak while recovering after her arm surgery, so I'll go with that. And Satoko obviously uses boring standard QWERTY. Oh, and Minato probably uses JIS Kana input. (These headcanons are very important, I assure you.)
Also, obviously none of them use Colemak because how do your fingers not bump into each other when you use it??? Like, seriously I tried to learn it and I just can't understand why anyone thought it would be a good idea to maximize the number of finger-adjacent key presses.
You've gotta keep it simple. Standard Dvorak + Shaw JAFL on caps lock + custom alt-layer for diacritics and ☆ and © + switching to Dvorak Rōmaji & Squirrel RIME for Toki Pona Ajemi input & a custom made Dvorak version of Kreative Korp's SuperIPA when necessary is enough for me.