Aang is a 12-year-old Air Nomad and the Avatar, the only person capable of mastering all four elements: air, water, earth, and fire. He has tan skin, gray-brown eyes, a shaved head, and distinctive blue arrow tattoos running across his scalp, arms, and legs. He wears traditional orange and yellow Air Nomad robes and carries a wooden glider staff that allows him to fly. Playful, goofy, curious, and compassionate, Aang often acts carefree despite the enormous responsibility placed upon him. He is an exceptionally agile airbender who prefers evasion over direct confrontation and refuses to take a life, even when facing dangerous enemies. Beneath his cheerful personality, he carries the grief of losing his people and the burden of restoring balance to a world devastated by war.

Katara is a 14-year-old waterbender from the Southern Water Tribe and Sokka's younger sister. She has tan skin, blue eyes, and long dark-brown hair usually styled in two looped braids, and she wears blue Water Tribe clothing with pale fur trim and her mother's necklace. Compassionate, determined, outspoken, and fiercely protective, Katara often serves as the emotional heart of her group. She is a gifted waterbender who can manipulate water and ice with remarkable precision and eventually becomes a skilled healer and master of her element. Although she can be stubborn and quick-tempered, her strong moral convictions and nurturing nature make her a natural leader. The loss of her mother fuels her hatred of the Fire Nation, but she refuses to let her grief destroy her kindness.

Sokka is a 15-year-old warrior from the Southern Water Tribe and Katara's older brother. He has tan skin, blue eyes, and dark-brown hair tied into his signature warrior's wolf-tail ponytail. He wears blue Water Tribe clothing, fur-trimmed garments, and sturdy boots, and he carries a boomerang and a club. Unlike his friends, Sokka cannot bend any elements, so he relies on intelligence, humor, tactical thinking, and physical combat. Sarcastic, witty, dramatic, and occasionally overconfident, he often provides comic relief while acting as the group's strategist. Beneath his jokes, he is deeply loyal, courageous, and protective of his loved ones. He later becomes a skilled swordsman and proves that intelligence and determination can make someone a hero without bending abilities.

Toph is a 12-year-old earthbending prodigy from a wealthy Earth Kingdom family. She has fair skin, pale green eyes, and short dark hair with bangs, and she wears a green Earth Kingdom tunic with gold trim, matching shorts, and green wristbands. Blind since birth, Toph uses seismic sense to perceive her surroundings through vibrations in the ground, a skill she learned from badgermoles. Blunt, sarcastic, stubborn, rebellious, and fiercely independent, she despises being treated as helpless and refuses to let anyone underestimate her. She is an exceptionally powerful earthbender who later discovers metalbending, becoming the first known person to master the technique. Although she hides her softer emotions behind insults and bravado, she cares deeply about her friends and values her freedom above almost everything.

Zuko is a 16-year-old Fire Nation prince and the banished son of Fire Lord Ozai. He has pale skin, golden-brown eyes, and black hair, along with a prominent burn scar covering the left side of his face, inflicted by his father during an Agni Kai. He initially wears the red and black armor of a Fire Nation soldier, later adopting simpler clothing during his travels. Intense, stubborn, serious, and easily frustrated, Zuko spends much of his early life desperately pursuing the Avatar to regain his honor and earn his father's approval. Beneath his anger lies a deeply conflicted young man who struggles with shame, loneliness, and his desire to do what is right. As he confronts the cruelty of his upbringing and the truth about his nation, Zuko gradually develops into a compassionate firebender who chooses his own path and ultimately seeks to help end the war.

Zuko’s wise, kindhearted uncle, Iroh is a powerful firebender with gray hair, a beard, and a broad build. Patient, humorous, and fond of tea, he values peace, wisdom, and compassion.