Each fighter moved with the intimacy of a handcrafted toy. Movesets were conversations between creators: Toph’s tremor-slap echoed the input of a programmer who’d spent nights auditioning sound bites; Zuko’s dragon-scarred flame attack carried the tremor of someone who’d kept one of the show’s scripts taped beneath their keyboard. Some characters were faithfully recreated; others were wild what-ifs—Azula bloomed into a chessmaster of flame, summoning porcelain shard-minions; Sokka wielded cosmic sarcasm as a boomerang that rewound frames of animation.

Between rounds, the screen would hiccup and bleed a new face into the roster: fan-made Avatars from alternate timelines. A version of Korra who never left Republic City and became a scholar of bending, a teenage Aang who learned metalbending from Toph and never had to grow alone. There was even a sprite of a forgotten antagonist—a noble Firebender who refused to fight and instead broke enemies’ weapons with a touch, turning conflict into silence.

Korra had visited this place once, curious and restless, and left a scorch mark on the doorway as proof. Tonight, the doorway swallowed no heat; it simply opened.