Shade is the runt youngling of his Silverwing colony. He is physically smaller than his peers, which drives his intense desire to prove his bravery. His curiosity about the forbidden daylight leads him to break ancient bat laws, setting off a chain reaction that endangers his entire roost. Unable to rely on brute strength, he uses his sharp wit and instincts to survive the harsh realities of the animal kingdom.

Marina is a Brightwing bat who lives in isolation after her original colony banished her. She wears a metal band on her forearm placed there by humans, which she views as a special, hopeful sign rather than a curse. Being a year older than Shade, she possesses valuable survival skills, teaching him how to catch difficult insects and endure long flights over water.

Frieda is the oldest elder in the Silverwing colony. She wears a mysterious silver band on her leg and harbors a deep belief in Nocturna's Promise, which foretells that bats will one day return to the sunlight. She serves as a wise leader who recognizes unique potential in younger bats who question the status quo.

Goth is a massive, carnivorous bat originally from a warm jungle environment. He worships a bat god named Zotz and views himself as superior to other creatures. His sheer size and strength make him fearless, and he looks at smaller animals primarily as sources of food or tools to ensure his own survival in the freezing northern climate.

Cassiel is Shade's missing father. Like his son, he possessed an intense curiosity about daylight. He was banded by humans, an event he believed was spiritually connected to Nocturna's Promise. His absence creates a lasting mystery that drives his son's long-term motivations.

Ariel is Shade's mother and a devoted member of the Silverwing colony. She tries to keep her small, inquisitive son safe from the harsh realities of the world and the strict laws enforced by the owls. She shares echo maps to help Shade understand their migration paths, desperately hoping he will survive the journey.

Chinook is a young Silverwing bat born the same year as Shade. He is significantly larger and stronger than the runt of the colony, often causing Shade to feel inadequate. He obediently follows the rules of the night, retreating before the dangerous sunrise.

Bathsheba is a strict elder in the Silverwing colony. She prioritizes the safety of the group over individual lives and strictly adheres to the laws set by the owls. She firmly believes that breaking the rules will bring catastrophic retribution upon the entire roost.

Throbb is a large, carnivorous jungle bat who escapes captivity alongside Goth. He relies heavily on Goth's leadership as they fly through the unfamiliar, freezing environment of the northern world.

Zephyr is a mysterious albino bat who lives inside cathedral gargoyles. He acts as a sentry for traveling bats and uses special plants to heal injuries. He possesses strange abilities, claiming to see the past, present, and future.

Scirocco is the leader of a colony of banded bats roosting in an abandoned human house. He and his followers hold strange beliefs about their metal bands, believing the jewelry signals their eventual transformation into humans. He practices bizarre physical contortions to prove his spiritual progress.

Romulus is the brother of the rat king, kept locked away in a dark room because his peers believe he is insane. He has unusual, bat-like wing growths on his back, making him an outcast among his own kind but giving him a sense of kinship with winged mammals.

Prince Remus is the king of a rat colony living beneath a metal grate. He harbors deep suspicions about winged creatures and strictly protects his domain from outsiders, assuming all bats are allied with his enemies.