Helvetica: "I'm a diehard serif bitch and it's the only sans serif i love", "Something, something, graphic design.", "It's a great one for slideshow titles"
Exocet: "The flavor font of choice for the DnD setting books for Planescape, exocet is easy to read, easy to replicate, and just plain fun to look at. Look at that O!"
Something I never see talked about and honestly reasonably so, but still makes me sad are the people besides Toby and Temmie that worked on Undertale and how it was a snap shot in the golden age of webcomics
Toby being heavily part of the webcomic scene with his involvement in homestuck likely leading him to be in contact with:
Gigi DG:
Michelle Fus (aka Tiny Paint):
J.N. Wiedle:
They helped design Undyne’s outfits but Sans and Papyrus are literally direct references to the main in their skeleton comic whos named after a font
Magnolia Porter:
was an assistant monster designer
btw this is an incomplete list of the developers and even ones with their own personal webcomics these were just some of the ones I held close to my heart