Late nineties to early two thousands on an arch-based distro is Ayanami Rei territory for sure

EDIT: could also be Serial Expeirments Lain or Major Kusanagi depending on your age and horniness in asking this question

"If only there was some kind of late 90s anime featuring C and lisp that's also heavily associated with linux users."

Finally someone asking the real questions

To match the era the monogatari ladies such as shinobu. Especially since it's such a small laptop.

Or card captor Sakura for 90s.

Bulma?

What is that Plasma theme? I need.

Anyone from Dragonball.

Or Love Hina. There's some great choices there.

None.

Just have a big throbbing veiny anime cock spraying cum everywhere.

Aisha Clan-Clan is a perfect fit. Outlaw Star came out in 1998, about in the middle of the desired time period. The green in her typical outfit matches the green in your terminal.

If youre looking to go less super popular, Armitage III, Ah! My Goddess, Slayers, Macross II are some of my all time favorites!

I'd go with a touhou character. Maybe Ran Yakumo.

What about the anime version of Keith, the C++ mascot?

https://www.newgrounds.com/art/view/foxdance/keith-the-c-rat-mascot