Xenia Linux – An Immutable Linux distribution based on Gentoo Linux (xenialinux.com)

Gentoo and Flatpak--there's an interesting combination. [1] Flatpak for GUI apps, Distrobox for CLI, and Portage for base system stuff.

[1] https://wiki.xenialinux.com/en/latest/usage/installing-apps....

All I can think of is Xenia Onatopp.

Isn't xenia the Xbox 360 emulator?