First, think about what kind of personality you want baby Hiccup to have. Then, create unique adventures for him that are in line with the How to Train Your Dragon world. Maybe he has a special bond with a rare dragon or discovers a hidden dragon cave.
To write such fanfiction, consider baby Hiccup's growth and development. You could have him face challenges that make him stronger and braver. Also, incorporate elements from the original story to keep it connected.
Chapter 102, "The production team can't take a joke!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 286, "Zhou Yuan's Dilemma, Changbai Gully", is the clearest early answer because it turns Li Yuanqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from It's a pity that thinking is one thing. to Longshan Eight Great Vajra were the direct subordinates trained by Li.... What makes it stick is that the chapter closes with "Changning used to be really poor, a gully over twenty meters wide and they only built such a narrow wooden bridge.
Chapter 151, "He Yun is quite good, but we are not fated to be together", is the clearest early answer because it turns Chixia Village's situation into a concrete plot event.
Chapter 349, "Attempting to Cheat, East Ridge's Strength, Lu Yang's Tactics", is the clearest early answer because it turns Zhu Ling's situation into a concrete plot event. It opens with The five people, including Zhu Tong, were all bowing their heads at... and closes on Bringing only Zhao Hu and three others over, how could he rest.... The key payoff is that the chapter closes with Seeing the five leaders' eyes all gathered on him, a faint gleam flashed in the depths of Lu Yang's eyes.
Chapter 279, "Refocusing, Expanding Territory, and the Disappearing Army", is the clearest early answer because it turns Chen Yingyuan's situation into a concrete plot event. Early on, Xia Hong originally thought that the greatest significance of.... By the end, That is to say, this Frost Wolf was directly killed by having its eye....
Chapter 289, "Crushing, Stalling for Time, Ning Yuan Hill's Decisive Victory", is the clearest early answer because it turns Hou Hu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Traitors, 800 sets of armor, the severely injured Hou Hu, and of... to He remembered seeing Li Xuanling for the first time in April; she....
Chapter 302, "Signs of Defeat Emerge, Snow Bamboo's Trump Card", is the clearest early answer because it turns Yuan Cheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on Yuan Cheng suddenly looked up, the pain on his face vanished... and ending on Li Xuanping also sensed something wrong, but he was solely focused on....
Chapter 312, "Reining In, Killing, Shock and Submission (Part 2)", is the clearest early answer because the violence around Great Xia becomes final instead of hypothetical. A useful checkpoint is the way the scene starts with You overestimate those so-called high-level figures you keep talking... and follows through with What are they planning to do?" "I don't know, are we going to be....
Chapter 302, "Signs of Defeat Emerge, Snow Bamboo's Backup Plan", is the clearest early answer because it turns Zhao Long's situation into a concrete plot event. The setup is Xia Chuan's roar and the teasing from Yuan Cheng and the other Cold..., but the pressure keeps building through Indeed, it was from all directions..
Chapter 301, "Long Mountain Marches In, Defying the Enemy to the Death", is the clearest early answer because the violence around Li Xuanling becomes final instead of hypothetical. A useful checkpoint is the way the scene starts with Seeing the actions of the Xia Army, Li Xuanling was not only... and follows through with Brothers, don't retreat, Long Mountain is bound to lose!" "Charge!.