The plot would change a lot. If Harry was a dog, for instance. His loyalty would be even more pronounced. He might be more likely to follow his friends into dangerous situations without question. Also, the way he approaches challenges would be different. Instead of using magic wands and spells, he might rely on his animal instincts like a strong sense of smell to track down things. This could lead to different solutions for the mysteries in the story.
If Harry was replaced with a deer, his grace and speed could play a big role. In the Triwizard Tournament, instead of using magic to get through the tasks, he could use his deer - like abilities. He could jump over obstacles and run really fast. And in the face of danger, like when Voldemort is around, he could use his ability to blend into the forest, since deer are good at camouflage in their natural habitats. This would completely shift the way battles and challenges are faced in the story.
Let's say Harry was a raven. Ravens are often associated with mystery and intelligence. A raven - Harry would be able to fly around Hogwarts and spy on the bad guys more easily. His communication might be in caws and clicks which could be a code that only certain people or animals in the wizarding world could understand. The plot would then revolve around decoding his messages and using his unique perspective from the air to uncover secrets. For example, he could discover hidden passages or the whereabouts of Horcruxes by observing from above.
Chapter 315, "Breakfast With Lord Ellian I", is the clearest early answer because it turns Damien's situation into a concrete plot event. The chapter turns that into something concrete by moving from The sun had barely begun its full rise when the trio stepped out of... to The Town Lord was forced into war.. What makes it stick is that the chapter closes with Damien smirked, reaching for a slice of bread.
Chapter 116, "Great Righteousness, Hunting Flood Dragons, Saliva [Five-in-One Mega Chapter]", is the clearest early answer because it turns Luo Yuan's situation into a concrete plot event. The setup is There are three large trees around, just barely reaching Teng Jiao's..., but the pressure keeps building through I'll go to the one on the left..
Chapter 107, "The Tremendous Peril of the North Slope Cliff【3-in-1 Mega Chapter】", is the clearest early answer because it turns Chen Ye's situation into a concrete plot event. The chapter gives readers a real answer by opening on If we still can't find them in Redwood Ridge tonight, we'll have to... and ending on Their stations are quite similar to the slope where Great Xia was....
Chapter 17, "Da Shi Camp", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The chapter gives readers a real answer by opening on If not for the timing being unsuitable, Xia Hong would truly praise... and ending on After reaching the top, the four went straight to the center, brushed....
Chapter 344, "Making Money", is the clearest early answer because it turns Damien's situation into a concrete plot event. Early on, The crowd was still buzzing from the last match, half-drunk on.... By the end, The fight stretched on, blades clashing with skin, boots scraping.... Inside the broader family politics storyline, the chapter closes with Because no one suspects a man who walks away with nothing.
Chapter 459, "Camping In Another City", is the clearest early answer because it pushes Delwig into a new phase or setting. A useful checkpoint is the way the scene starts with By the time they reached the city's outer gates, dusk had already... and follows through with We rest for now… but I don't think this peace will last..
Chapter 315, "Breakfast With Lord Ellian I", is the clearest early answer because it turns Damien's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The sun had barely begun its full rise when the trio stepped out of... and follows through with I'm not in the habit of negotiating with starving people." Damien.... By the close, The Town Lord was forced into war., and the chapter closes with Damien smirked, reaching for a slice of bread.
Chapter 493, "Leaving Grimhorn", is the clearest early answer because it turns Damien's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Garrick looked at him sharply, searching his face. and follows through with Then the larger creature lifted its head..
Chapter 98, "Golden Sore Powder", is the clearest early answer because it turns Cheng Feng's situation into a concrete plot event. The chapter turns that into something concrete by moving from The specific effects of the Medicine Decoction Pot were unclear to... to Though they now had animal traps and Xia Hong led their missions, as....