Well, in many fanfictions, Naruto might first awaken Susanoo during a really intense battle. Maybe he's pushed to his limits while fighting a super - strong enemy, and his latent Uchiha blood (if that's part of the fanfic's premise) gets activated, leading to the awakening of Susanoo.
It could be that Naruto is exposed to some sort of ancient chakra or a special kekkei genkai - related event. For example, he might enter a sacred area where the power of Susanoo is somehow connected, and this exposure causes his body to react and awaken Susanoo. This would be a more unique take compared to the typical battle - induced awakening.
In some fanfictions, Naruto's emotional state plays a huge role. If he experiences a great loss or extreme anger, similar to how Sasuke awakened his Sharingan, it could trigger the awakening of Susanoo. For instance, if a dear friend is in mortal danger or gets seriously injured, Naruto's emotions might reach a peak and unlock this powerful ability.
Chapter 148, "Mysterious Visitor, Deciphering the Cold Resistance Level [Vote for Monthly Pass]", is the clearest early answer because Gao Yu finally turns buildup into a real advancement. A useful checkpoint is the way the scene starts with After introducing himself, he showed a hint of helplessness, cupped... and follows through with While Xia Hong's expression went from dazed to fearful, and....
Chapter 154, "Inheritance Rights, Strategic Contraction [Sorry for the Delay]", is the clearest early answer because Wood Puppet Monster gets a payoff that changes the stakes. It opens with They still have the leisure to battle us, these fools!" "Hahaha,... and closes on In this way, wouldn't the Great Xia gain an advantage for free!.
Chapter 90, "【Seeking First Subscription】Chapter 90 Wooden Mannequin", is the clearest early answer because it turns Cold Beast's situation into a concrete plot event. Early on, This..." "Three Cold Beasts hunted in one night?" "How is this.... By the end, Let alone ordinary people, even those in the Logging Realm reacted....
Chapter 77, "Luo Ming's Commission", is the clearest early answer because it turns Cold Beast Meat's situation into a concrete plot event. The chapter gives readers a real answer by opening on Leader Luo, what brings you here?" It was none other than Luo Ming... and ending on He stood up from beside the furnace and walked up to Xia Hong..
Chapter 145, "Murder, Gruesome", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with These bastards!" He Meng gritted his teeth and shouted angrily, then... and follows through with If he had known, he certainly wouldn't have used Beast Blood to go....
Chapter 156, "Mirror Immortal, 10 Days to Gather Beast Blood", is the clearest early answer because it turns Cold Resistance Level's situation into a concrete plot event. It opens with Do you think the leader's decision was meant to exclude us?" "What... and closes on As the Teng Jiao fell, Xia Hong, without a moment's hesitation,....
Chapter 162, "Once and For All, Victory", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. Early on, The remaining forty-plus Earth-digging Realm individuals continued to.... By the end, Before the cold beast tide arrived, Xia Hong had already successfully....
Chapter 164, "The World in the Mirror, Immortal", is the clearest early answer because it turns Beast Blood's situation into a concrete plot event. It opens with That Xia Hong's strength is actually so formidable, it's actually so... and closes on He Yuanhun, all these years, to control me, although you've handed.... The key payoff is that the chapter closes with Yuwen Hu continued with a trace of sorrow on his face: "It was a defeat.
Chapter 153, "Terrifying Colors in the Dense Forest, Mirror Immortal Gu Shadow", is the clearest early answer because it turns Yuwen Hu's situation into a concrete plot event. The chapter gives readers a real answer by opening on But the problem is, why aren't they afraid of the solidified fire oil... and ending on Quickly scanning with his peripheral vision, Xia Hong seized an....
Chapter 83, "Creating an Echo Chamber", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The setup is After several disasters, coupled with the recent encounter with the..., but the pressure keeps building through Xia Hong gained a deeper understanding and reflection on the plight....