Every nation can carry a whole campaign. The comet clock still ticks in the background. Tell Franz a starting POI and sub-location: I am starting at @Fire Nation Capital, Capital Harbor, Refugee Quay.
FIRE NATION
Hook 1: You fled @Roku's Island or served on Sozin's "rescue" flight and must decide what you saw. Begin at the Refugee Quay or the Royal Dragon Aerie. Talk to Ta Min, Madam Sora, Dockhand Reki, or Ferryman Batsu.
Hook 2: You are posted to @Yu Dao as clerk, soldier, or settler as expansion quietly resumes. Wudao and Sarn work the harbor; Bohai bakes in the Old Earth Quarter.
Hook 3: You are a sage at @Crescent Island Fire Temple when orders arrive to honor Roku — and to watch for a new Avatar.
Quest seeds: The Island Witnesses (Jin, Sora, Reki, Viro, Sen, Azane). The Comet Charts (Ruga's loft). Rina's Flight (Old Caldera Townhouse; Batsu may have ferried a hooded woman). Lambak Steel. The Dragon Aerie. Street work: Hwan's pot, Togaru's coal, Ko's tiles.
EARTH KINGDOM
Hook 1: Lower Ring or flood refugee at @Ba Sing Se, Cabbage and Culm Market — people have started disappearing toward the lake. Start at Wen's Broth, Gan's cabbages, Mei-Lin's noodles, or The Crooked Cart.
Hook 2: Omashu chute worker or guard: the delivery system fails again; the queen wants proof of Ba Sing Se sabotage. See Dak, Heng, Sern, and Master Cho.
Hook 3: Kyoshi Island warrior: Fire sails have been sighted in the eastern sea, and Headwoman Oyuki wants scouts, not speeches.
Quest seeds: Powderkeg Yu Dao. The Quiet Lake (Pao, Hui, Yun, Lian, Shoufen). Chute and Dagger. Heirs of the Silenced Sages (Cailin, Goro). Sand and Secrets (Krik, Dart, Wan Shi Tong). Street work: Gan's cart, Mei-Lin's supplier, Min's unpapered child, Yun's intercepted letter.
WATER TRIBES
Hook 1: Agna Qel'a academy student or gate warrior: ships return from Chenbao with contraband stamps and spirit-sickness. See Nukilik, Pakak, Iqaluk, Taktuq, or Old Tukka.
Hook 2: Wolf Cove hunter or boatwright: the South must decide whether to arm, trade, or call a conclave at the Sacred Island now that the Avatar is dead. Niri, Silla, Atuq, Rinuk, and Siku all have pieces.
Hook 3: Foggy Swamp listener: the banyan grove has begun to dream of fire in the sky.
Quest seeds: Passage to War (Pei vs. Tulok; Pakak's stamps). The Restless Ice (Yupik, Taqukaq, Iqaluk's sick guest). Conclave on the Sacred Island. The Diplomat's House (Sana; Niri's lid-note). Street work: Silla's crate, Atuq's unannounced audience, Tukka's Pai Sho test.
AIR NOMADS
Hook 1: Southern student or kitchen hand under Gyatso when the news of Roku arrives and testing begins in the children's courtyard. Jigme, Paljor, Mother Tashi, and Fen are already in the village and on the steps.
Hook 2: Eastern pilgrim or nun when a mine-scar spirit (Stone Dreamer) wakes again and Pathik is cooking in the lower hostel. Saffron Wei is selling spice on the market mat.
Hook 3: Guiding Wind youth on the protest ridge of the Fire & Air Center, watching Fire banners tighten.
Quest seeds: The Testing (Norbu's blank line; Jigme's extra pies). Empty Cloisters (Padma and Yeshe). Envoys with Kind Smiles (unmask Fen; Paljor's incense binge). The Unbound Circle (Khandro, Zeisan, Rioshon). Past-Life Wind. Street work: keep Fen busy, escort Wei, use Padma's cliff lift.
PARTY-READY OPENERS (mixed-nation tables)
The Evacuation: PCs on the Refugee Quay or still smelling of ash. Ta Min needs help finding Rina. Kenji, Viro, Sen, Reki, Jin, Sora, or Batsu has a piece of the true timeline. Azane is already helping.
The Testing: Southern Air Temple, children's courtyard. Norbu has not written a name down. Fire condolence envoys want a tour. Gyatso asks the PCs to take a walk with a cradle or a student. Fen is already buying incense.
The First Colony Push: Yu Dao's terrace and bakery basement, the same week official mourning banners go up in the Capital. Wudao and Sarn work the water.
The Pai Sho Game: Amara or Cho invites strangers in The White Teacup after a tile, a past-life dream, or mercy to an evacuee. Ko or Old Tukka may have sent them.
Paste-ready last line for a campaign open: The mountain is still smoking. The Fire Lord is in mourning. Somewhere in an Air Temple, a child has just taken a first breath. You have twelve years.