Downloading the font package for Vita3K is a vital step in setting up your emulator. By installing the official Sony firmware .PUP file through the Vita3K interface, you unlock the necessary assets to display text correctly across your entire library.
A progress bar will appear. Once finished, Vita3K will notify you that the have been successfully installed. Manual Installation (Advanced)
When you first launch a game, the emulator looks for these specific font files in its system folders. If they aren't there, the emulator tries to substitute them, which often leads to: Main menus with no words.
How to Download and Install Font Packages for Vita3K: The Ultimate Guide
Some games require specific character sets to even initialize.
If the automatic installer fails, some users manually place font files into the emulator's internal directory. Usually, this is found under: Roaming/Vita3K/common/font/