I was about to ask a question about whether Marcellus is serif or sans-serif, or something else altogether. However, I don't know if that'll be on-topic for being too specific to a font and veering too far from general graphic design. Is it on-topic to ask questions about a specific font?
I think that would be on topic. Here's a similar question: Is the OCR-A sans-serif?. The types of font-specific questions we would want to avoid are "where can I download/buy X font?", which is much less related to design in comparison to your question.