Okay, so. We know what Chai's handwriting looks like, canonically, thanks to his Project Armstrong paperwork:
Very painstakingly-formed letters, lots of goofy dramatic flourishes, but still distinctly wobbly, with inconsistent angles on the vertical strokes. (It definitely supports the fandom theory that he had to re-learn to write with his left hand, a bit awkwardly, after he lost the use of his dominant right arm.)
And we have lots of samples of Peppermint's handwriting, from the journals scattered around the hideout and the note she left for Kale:
Simple, straightforward block printing. Pretty easy to read, though it goes a bit chickenscratch when she's taking notes in a hurry.
But I've spent way too much time looking at the assets for the hideout, and I find it extremely funny that at least one of the equations in her notebooks is written in what looks like Chai's handwriting. Check it out:
Look at that "t", especially. That's...totally Chai's handwriting??
I know the real-life explanation is probably that it's random scribbles on a minor background prop, and Tango didn't bother to keep close track of which asset artist was writing what, but. It still amuses me to imagine Chai casually adding his own calculations to Peppermint's notes, like:
"Six plus six equals twelve, Peppermint. I can do the math, I'm not dumb..."
(Grabs her mission report book, scribbles down a random calculus equation from memory, solves it, and hands it back to her.)
(Belatedly notices that everybody in the hideout is struck silent and staring at him in disbelief.)
"........ What? Like it's hard?"
