Comment by BuckyBeaver

That's unfortunate.

One thing I don't like about Plex aesthetically is that the italic faces have right-facing serifs on the bottom of most letters for some reason. It's needlessly inconsistent.

Here's a list of sans-serif fonts I've found that have proper capital "i":

Chivo (O and zero different width): https://fonts.google.com/specimen/Chivo

Clear Sans (O and zero indistinguishable): https://www.fontsquirrel.com/fonts/clear-sans

Comme (O and zero different width): https://www.fontsquirrel.com/fonts/comme

Darker-grotesque (O and zero different width): https://fonts.google.com/specimen/Darker+Grotesque

Dejavu-sans-mono (zero clearly different): https://www.fontsquirrel.com/fonts/dejavu-sans-mono

Didact-gothic (O and zero different width): https://fonts.google.com/specimen/Didact+Gothic

Droid-sans (O and zero different width): https://fonts.adobe.com/fonts/droid-sans

Droid-sans-mono (O and zero different width): https://fonts.adobe.com/fonts/droid-sans-mono

Luciole (O and zero slightly different width): https://www.luciole-vision.com/luciole-en.html

Metrophobic (O and zero different width): https://fonts.google.com/specimen/Metrophobic

Monda (O and zero different width): https://fonts.google.com/specimen/Monda

Nobile (O and zero different height): https://fonts.google.com/specimen/Monda

Noto-mono (zero clearly different): https://fonts.google.com/noto/specimen/Noto+Sans+Mono

Noto-sans (O and zero different width): https://fonts.google.com/noto/specimen/Noto+Sans

Sen (O and zero different width): https://fonts.google.com/specimen/Sen

Tiresias-infofont (O and zero indistinguishable): https://www.fontsquirrel.com/fonts/tiresias-infofont

Victor-mono (zero clearly different): https://rubjo.github.io/victor-mono/