In the 'harry has dangerous pets fanfic', perhaps Harry has a basilisk as a pet. Since basilisks are extremely dangerous, he has to figure out a way to control its deadly gaze. He might befriend it in a way that no one else thought possible, and the story could show how this unique relationship changes Harry and the Hogwarts environment.
Maybe Harry has a dragon as a pet, and he has to hide it from the wizarding authorities. He faces challenges in training it and keeping it safe from those who might want to use it for evil.
Well, it could be that Harry discovers a magical and dangerous creature in the Forbidden Forest. He decides to keep it as a pet secretly. The story might revolve around how he manages to care for it and the adventures they go on together, all while trying not to get caught by Hogwarts professors.
Maybe there's a dark wizard who wants to steal Harry's dangerous pets to use them for his own evil purposes. This wizard could be constantly trying to find a way to get to Harry's pets and use their powers for destruction.
Dangerous pets can create a lot of chaos in the plot. For example, if a character has an uncontrollable dragon as a pet, it might escape and start causing destruction in Hogwarts or the surrounding areas. This would lead to a big crisis that the other characters have to deal with.
In some fanfics, Harry Potter might have additional pets like a Kneazle. A Kneazle is a magical cat - like creature that is intelligent and has some special abilities.
Acromantulas are also potentially deadly pets in fanfiction. These giant spiders are intelligent and aggressive. They can overpower wizards and witches with their size and venomous fangs, and their colonies can be a great threat.
Perhaps the plot could involve Harry inheriting the Sharingan from a long - lost relative who had some connection to the Naruto universe. With the Sharingan, he can perceive things that normal wizards can't, like the flow of magic in a more detailed way. He might use this to develop new spells or to understand the nature of magic better. And in battles, he could use the Sharingan's abilities like predicting his opponents' moves and copying spells, which would give him a huge advantage against the Death Eaters and other foes.
One of the dangerous pets in Harry Potter fanfiction could be a werewolf. In some stories, a character might try to keep a werewolf in a controlled environment, which is extremely dangerous as they lose control during full moons. Also, a manticore with its human - like face, scorpion - like tail and ability to shoot spikes is a very dangerous creature that could be a pet in fanfiction. And let's not forget the Grindylow, a water - dwelling creature with sharp teeth and a penchant for grabbing at people in the water.
Well, perhaps the tattoos could be a mark of a secret society within the wizarding world that Harry gets involved in. They might give him special powers or knowledge.
The plot might involve Daphne's internal struggle. She has this crush on Harry but is afraid of being rejected. So she first tries to befriend Harry's friends to get closer to him. She could also be competing with other girls who are also interested in Harry. As the story progresses, she might gather the courage to confess her feelings directly to Harry.
I'm not sure about the specific plot of such a fic as it's not a common or appropriate topic in mainstream literature. Fanfics with such strange and inappropriate themes may deviate from the essence of the original work and good taste.
The fanfic could also be about how Harry's past experiences shape his parenting. Given his own difficult childhood, he would be extremely determined to give his baby a loving and secure environment. He might teach the baby about the importance of friendship and courage from a very young age, and the baby could grow up with a strong sense of justice, much like Harry did.