Well, if it's a fanfic about Harry as an Animagus in relation to a chair and a unicorn, it could be really creative. Maybe Harry's Animagus form has some special interaction with the chair that is enchanted in some way, and the unicorn might be a symbol of magic or a helper in the story. However, without more details, it's hard to say exactly what the fanfic is about. It could also be a humorous take where the Animagus form has to deal with the chair as an obstacle and the unicorn is a magical guide through this strange situation.
I'm not sure which specific fanfic you're referring to. There could be many fanfictions that involve Harry being an Animagus and having some sort of connection with a chair and a unicorn. You might want to check some popular fanfic websites like Archive of Our Own or FanFiction.net and search for relevant tags like 'Harry Potter', 'Animagus', 'Chair', 'Unicorn' to find it.
Chapter 86, "Animal Trap", is the clearest early answer because it turns Huang Yong's situation into a concrete plot event. Early on, In light of the Great Xia's perilous migration, for the two.... By the end, Xia Hong understood Luo Yuan's words, but showed no reaction.. Inside the broader family politics storyline, the chapter exposes hidden motives around Huang Yong, so readers can finally see how the conspiracy layer of the plot is actually moving.
Chapter 224, "Cold Resistance Level Classification, Gains and Persuasion", is the clearest early answer because Long Mountain finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from If Long Mountain only refused other camps to merge, it wouldn't be... to Moreover, while eavesdropping on Hou Tong and others, Hou Tong had....
Chapter 155, "Lone Ranger, Xinggu Pass", is the clearest early answer because it pushes Hunting Team into a new phase or setting. The chapter gives readers a real answer by opening on With this, Xia Hong was far from feeling despair; instead, he became... and ending on The mountain curves in rather than breaks off, and it continues to....
Chapter 212, "Dispute—Can't Hold It?", is the clearest early answer because it turns Yue Feng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After two years in the Beehive, Luo Ming hadn't attained elite... and follows through with There's no need to offend Cheng Ping at this time." "Elites, elites,....
Chapter 108, "Long-tailed Rodent [3-in-1 Mega Chapter]", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. Early on, Xia Hong leaped to block on Luo Yuan's left side, only exchanging a.... By the end, Leader, it's trying to run!" Before he could relax for long, Xia Hong....
Chapter 139, "Resource Gap, Changes in the Camp [Three-in-One]", is the clearest early answer because it turns Special Function's situation into a concrete plot event. The setup is The basic strength of an Intermediate Snow Mane should be around..., but the pressure keeps building through Without any iron tools, it's impossible for humans to hunt it....
Chapter 135, "The Fearless Mirror Immortal [Three in One]", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. It opens with With a thundering crash, the massive body collapsed to the ground,... and closes on The crowd gathered around the Snow Mane corpse, their words filled.... The key payoff is that the chapter closes with Three or four kilometers north, there was a large Cloud Mist Zone, its estimated range some five or six hundred meters wide;
Chapter 153, "The Terrifying Hue of the Dense Forest, The Shadow of Mirror Immortal Gu", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. Early on, Xia Hong's murderous intent was intense, not holding back in the.... By the end, As if confirming something, his face was instantly filled with....
Chapter 190, "Xia Li, 4 Articles, Someone is Coming", is the clearest early answer because it turns Xia Li's situation into a concrete plot event. Early on, Is this Reshaping Skin stage really that magical, that one must.... By the end, He couldn't explain this situation either.. Inside the broader family politics storyline, the chapter closes with Below, Yuwen Dao, Yue Feng, and the others were stirred awake by Xia Hong's voice.
Chapter 185, "New Home, Land, Arrow Bamboo Forest", is the clearest early answer because the buildup finally cashes out in a real clash. It opens with And the grand golden chair on the high platform added a touch of... and closes on Anyone who came in saw Xia Chuan standing above the second-floor....