Change Minecraft Font (NOT ONLY THE APPEARANCE)?

How to change your font in which you write (Not just that)

What do you mean by appearance?

You can use a mod / plugin to write in color with certain formatting codes, otherwise you can change its font through resource packs.

You just have to edit different text files, and rewrite everything in source code.

If you mean that, for example Writing in Comic Sans on NEN Mc server so that everyone sees it I have to disappoint you unfortunately. You can only change the font you see