There's a lot of red writing, such as in #29, #38, #265, #361, but those aren't cursive. Vaarsuvius's spellbook in #306 4th panel and #1021 5th panel are probably red cursive, but in both case the text is too small on panel to know for sure, and in #92 Vaarsuvius writes in red non-cursive, so I can't be sure. Someone did ask for cursive writing in an earlier thread, but nobody gave an answer other than #438 7th, but then that was back during the fourth book so there's plenty of new strips since. I don't know the answer.