RIME can be configured on Android via fcitx.

Try spelling it backwards ;)

Intel’s Clear Sans.

IBM’s Plex, I’m particularly partial to their condensed sans.

Fira Sans is a good generic recommendation, their mono is again worth considering.

Adobe’s Source family (sans, serif, mono) is another inoffensive, safe choice.

erewhon is a modern workhorse serif that pairs well with all the sans fonts above. It’s derived from Adobe’s Utopia, which is used in quite a few newspapers (clear and legible without taking too much space).

STIX Two was specifically designed to replace Times New Roman in scientific + mathematical publications, if you’re looking for a font that’s different but familiar to Times New Roman, I could not recommend it enough.

Charis SIL was originally designed for laser printers and later modified for use in linguistics, it’s essentially a serif version of Verdana (same designer too). As with all the other fonts mentioned, very broad character set support.

The TeX font catalogue is a treasure trove in general.

Edit: almost forgot, the Libertinus family also comes recommended for a more ‘professional’ look.