I use a font called Komika. It's 100% free, and was developed "with the intention of giving indie comic writers access to a font that isn't Tekton or Sans without having to pay for a pro font". I also use my own handwritten lettering for the non-dialogue text around the page for effect.
I also recently got a font called "TallMarker" as part of some huge typography kit sale. The sale's over now and I'm not sure where or how much the font is normally. TallMarker closely resembles the handwritten text I was doing initially. My only complaint about the font is that there's no '' or ' characters for some odd reason and it's frustrating. I have to use a different font to get ''
In terms of background text (like on walls, signs, etc...) it's usually what looks best for the application, although a common choice for me (as it is a sci-fi theme) is called Outlier (another free font it seems. Some people call it the "Star Wars" font when they see it in my work, but it's not the star wars font).