Marian has the mentality of a toddler; she is having troubles speaking some simple words such as the name of her comrades. She has also become naïve, and easily prone to pranks. For some reason, she has a particular tendency to wear her underwear on the outside and mess around with flour. She's also quite fixated on bandages, whether it be rushing over to grab a box of them or making use of them. She even wears a few bandages as a hairband, a keepsake from before she became a Heretic.