Re: Stephenie the Vampire Slayer
I freely admit, this shirt made me laugh SO HARD.
From a design perspective, the serif font you used is difficult to read on the shirt, particularly from a distance. I DO NOT advocate using comic sans! However, another sans serif font would likely be much easier to read, and if you found one with rounded edges it would have the added bonus of matching your characters.
Now that I'm thinking about it, the other thing that makes the font hard to read is the black outlining/background to the text and frames. With this color of shirt, I think it's dark enough that the white will stand alone and actually stand out more for not having the black bordering. Particularly on the frames, you could just make them a little thicker.
For some reason, the border on the people and stake doesn't bother me. That's probably because they have a lot more white to them so the border is more incidental, and they have other black features (eyes, stake, hair, sparkles)