Like when I saw people using Josephine to pretend things are from Splatoon and I furiously made Project Paintball to fix that problem, I was first overjoyed to find 8-bit Operator to be "the Undertale Font", but found it to be inaccurate.
So I made this suite of two fonts mimicking the font used in Undertale. Looks best at 10pt=13.333px.
I have also exported a Web font version. Due to differences in em size definition, this one looks best at 16px=12pt.
And here's some spacing because it seems that an appalling number of people are missing the download section.
Oh, and an Appreciation would be nice.