Prisma being a PC elitist and an Arch linux user started as a joke on her being a robot/computer. Heck the reason she's an Arch-user is because of running jokes about arch-elitists in the Linux & computer communities. Now that + most of my other robot OCs being linux users is canon
(+ this one's a joke trait, but because of this MH!Prisma would theoretically also be an Arch user if she could lol)