Avatar: The Last Airbender

While not explicitly depicted in the animated series, Avatar Kyoshi, a past Avatar who appears in ATLA in visions and flashbacks, is later confirmed in supplementary materials (novels 'The Rise of Kyoshi,' 'The Shadow of Kyoshi,' and 'The Legend of Korra: Turf Wars' comic) to be bisexual, having a significant same-sex relationship with Rangi. Additionally, the character Smellerbee, a member of Jet's Freedom Fighters who appears in multiple episodes (e.g., 'The Serpent's Pass,' Book Two: Earth, Episode 12), has an androgynous appearance and is mistakenly referred to as a boy by Uncle Iroh. Smellerbee firmly corrects him, stating 'I'm a girl,' which, while confirmed as cisgender by the Avatar Wiki, highlights themes of self-identification and external perception.

The Fire Nation's genocide of the Air Nomads is a foundational element of the series, depicted in flashbacks and referenced throughout, conveying mass death and destruction, particularly in the opening sequence and in episodes like 'The Southern Air Temple' (Book One: Water, Episode 3). Characters frequently engage in hand-to-hand combat and elemental bending battles, such as Aang's confrontations with Fire Lord Ozai in 'Avatar Aang' (Book Three: Fire, Episode 21) or Zuko's many duels, often resulting in characters being knocked unconscious or sustaining non-graphic injuries.

Aang frequently travels to the Spirit World and interacts with various spirits, such as Koh the Face Stealer in 'The Siege of the North, Part 2' (Book One: Water, Episode 20), presenting a supernatural realm that guides the Avatar. In 'The Puppetmaster' (Book Three: Fire, Episode 8), the Waterbender Hama reveals the dark art of bloodbending, a coercive technique to control others' bodies, which is depicted as disturbing and unnatural within the bending disciplines.

The episode 'The Puppetmaster' (Book Three: Fire, Episode 8) features Hama's bloodbending, where she physically controls people against their will, a concept that is visually unsettling and psychologically disturbing. The character Azula consistently displays cunning, psychological manipulation, and terrifying firebending prowess, leading to intense confrontations and contributing to Zuko's emotional torment and eventual breakdown in 'The Southern Raiders' (Book Three: Fire, Episode 16) and 'Into the Inferno' (Book Three: Fire, Episodes 19-21).

Toph Beifong, introduced in 'The Blind Bandit' (Book Two: Earth, Episode 6), is explicitly rebellious against her overprotective and traditional parents, running away from home to teach Aang earthbending and constantly challenging their expectations. Zuko's entire character arc involves profound rebellion against his abusive father, Fire Lord Ozai, and the Fire Nation's imperialistic ideology, which drives much of his internal and external conflict throughout the series.

The concept of the Avatar as a spiritual bridge between the physical and spirit worlds, and the reincarnation cycle of the Avatar (Aang being the latest in a long line of Avatars who draw power from their past lives), fundamentally differs from Christian theological views on a single God and the nature of the soul. The existence of a diverse pantheon of spirits and mythical creatures, like the Lion Turtles who grant bending (as depicted in 'Beginnings, Part 1 & 2' in 'The Legend of Korra', and retroactively informing ATLA's lore), presents a spiritual cosmology distinct from a Christian worldview.