What technical aspects should I check in a free comic font file to ensure quality and compatibility?

When evaluating a free comic font, check for a complete character set (including all common punctuation, symbols, and numerals), proper kerning and spacing to avoid awkward gaps between letters, and a variety of weights (bold, regular, italic) if available, which adds versatility. Ensure the file format is widely compatible (.ttf or .otf are standard) and that the font renders smoothly at various sizes without pixelation, indicating it's a well-designed vector font.