I'd like to see some more serif fonts. Although Helvetica is an attractive and world-wide standard sans-serif font. Palatino, Century, Lucida, and Garamond are pretty common and work on the majority of OS. Baskerville, Bembo, Caslon, and Bodoni are "old-school" but amazing typefaces, but a bit different.
Variety in fonts is always nice. Handwriting, thick, and geometric style fonts might help change things up. Some fonts that probably wouldn't be too much of an eyesore are: Quikhand Oranienbaum Nord Stellar Yellowtail (For the cursive peeps) SF Iron Gothic SF Orson Casua Base I personally like fonts that look like calligraphy or have a medieval feel (ex: Bilbo Swash Caps, Calligrafiti, Uncial) so it would be awesome to have since forums and ect. usually don't have a lot of those types of fonts.
Do you know that, by publicly saying this, you called for people always using with you comic sans on purpose? https://xkcd.com/590/ Anyway: not really important, not really burdensome, then why not.
