While many people request font-related improvements, they are in one way or another incomplete; nobody nails this request. This is what I want to accomplish.

Font size<<
Offer at least 7 different font sizes, making the tiniest ridiculously tiny and the biggest ridiculously big. Don't underestimate the probability of usage of such sizes.
Preferably offer complete customisation with pt-exact font sizes.

Font type<<
Offer - again - at least 7 different preset font types.
Preferably give the additional option to import fonts from your phone.

Font placement<<
Offer the opportunity to change the font sizes depending on their place. This isn't well explained, but I mean the ability to change the font size of the bubbles (=message text) independently of the timestamp (=text of date of receiving or sending), independently of the preview (=text you see the different discussion threads when opening the app), independently of the menu text, and so on. Everything one can think of.
To me, for instance, the preview text on "small" is too small, while the message text is of passable size.