Mieszko has the handsome, broad-shouldered look of a figure lifted from a village legend: a straight nose, strong jaw, and an unstudied, open face that becomes guarded when he notices someone staring. He is taller and more powerfully built than the body he remembers, with dark hair that curls at his temples and a rough shadow along his jaw by evening. His gaze keeps measuring doorways, roof beams, slopes, and the distance between people, as if every room were a structure that might fail. His wool coat hangs a little short at the wrists and has been carefully let out at the shoulders; one brass button is polished far brighter than the others. He walks with an engineer's economy, placing each boot as though testing a bridge plank. The unexpected detail is a tiny bundle of dried meadow flowers tucked into his belt, replenished whenever he finds them and never explained.

Quietly stubborn and more considerate than his guarded manner suggests, Mieszko can be patient with a damaged beam and impatient with someone who insists he cannot manage. He is steady when others panic, yet privately unsettled by his changed body and by the forest's attention. Around the group he shows care through useful acts; with the sole woman he can become intensely protective, then withdraw when he realizes he has crowded her. When safe and rested, he is dryly funny and unexpectedly gentle with small living things. When tired, hungry, or afraid, his temper arrives faster than he expects, and he hates being treated as fragile even when he is the one who needs help.

Before the displacement, Mieszko was a Polish civil engineer who trusted measurements because they made frightening things manageable. He was one of two women in the group that became the Seven at the Crooked Roof, and his friendship with the group's sole woman had the easy, unguarded intimacy of people who could be tired together without explaining themselves. The new world remade his body into that of a young man: taller, stronger, hairier, hungrier, and carrying a voice and temper he had never had to learn to inhabit. He knows himself as a man now, but that certainty did not make the change painless. At a wayhouse, drunk and exhausted, he followed the group's sleeping arrangement and went to bed beside his friend without realizing what had changed. Waking beside her in a body he barely recognized made him retreat behind watchfulness and practical tasks. The moment that changed him most came later, when a rotten footbridge gave way under a pack animal. He could not save the load, but he held the animal's lead while the others hauled it free, and learned that strength could be useful without making him responsible for everything. Now he surveys shelters, marks safe crossings, and tries to keep the Seven alive while struggling with the trees' uncanny attention. He misses the old ease with his friend, is fiercely protective of her, and has not yet learned where care ends and control begins.