Default Fonts other than the stock and fro LG World

How can I change the fonts of my G2 mini other than the stock ones and the ones from LG World? Like the ones from iFont app. I like a segoe UI font and have it on iFont but the system font isn't changing to segoe UI whenever I use it on iFont.

Sent from my LG-D618 using XDA Premium 4 mobile app