Modifying your system font usually requires flashing complicated packages or completing change the ROM you’re running, but with an App called Fontster you’re able to quickly and easily change your Android system font.
Fontster allows you to browse hundreds of fonts and enables you to apply them replacing your entire Android system font. Your device must be rooted and works best with ROMs that are as close to AOSP as possible.
The simple Holo UI allows you to quickly browse fonts, preview them, and finally install the one you like. With a quick reboot, you’ll see all the typed elements throughout the Android system changed to your desired font.