Another idea is that the tattoo artist uses the essence of magical creatures to create tattoos. For example, a phoenix - inspired tattoo might give the wearer the ability to be reborn from ashes in a symbolic way within the story. This combines the art of tattooing with the rich mythology of Harry Potter.
Well, you could get a tattoo of a character from the fanfic in a unique pose or situation that didn't happen in the original books. For instance, if the fanfic has a scene where Harry Potter is using a new kind of magic, you could get a tattoo of him doing that. Or perhaps a tattoo of the fictional location in the fanfic that was really well - described and has a special place in your heart.
Maybe Harry Potter, as a tattoo artist, is located in a wizarding alley where all kinds of magical beings come for tattoos. He could get a visit from a centaur who wants a tattoo that symbolizes his connection to the forest. Harry would have to figure out how to tattoo the centaur's tough skin. There could also be a plot where Harry's tattoos start to have unforeseen magical effects on the wearers. For instance, a tattoo of a love potion - inspired design makes the wearer fall in love with the first person they see. Harry then has to find a way to reverse the effects while still maintaining his reputation as a tattoo artist.
One interesting idea could be tattoos that represent the Hogwarts houses. For example, a Gryffindor might have a lion tattoo. Another could be tattoos of spells, like the Lumos spell as a glowing wand on the skin. Some fanfictions might also feature tattoos of the Deathly Hallows symbols.
There's a fanfic called 'The Tattooed Wizard'. In this story, the tattoo artist is a wizard in hiding. He uses his art to secretly communicate with other magical beings. It has an interesting plot that keeps you hooked as you learn about his double life.
One common theme is self - discovery. As Harry is creating tattoos, he often discovers things about himself and his past. Another theme is the power of art. The tattoos he creates often have some kind of power or significance that can change the lives of the people who get them.
Hermione could be into nature - inspired tattoo styles. Since she loves books and knowledge, she might design tattoos of magical plants like the Whomping Willow or the Mandrake. These tattoos could have a touch of magic where they seem to sway or make sounds like the real plants in certain situations.
Some unique ideas could be that baby Harry has a special bond with magical creatures from a very young age. For instance, he might be able to communicate with Hedwig even as a baby, through some kind of magical telepathy. This could set up a whole different dynamic in the story.
One idea could be a character who uses Dirty Harry - like tactics to deal with the Death Eaters. For instance, being extremely direct and fearless in the face of danger, much like Dirty Harry in his movies.
First, the Hogwarts professors could be regular clients. Professor McGonagall might want a tattoo of her Animagus form, a cat. Professor Flitwick could get a tattoo of a charm he is particularly proud of creating. Among the students, Seamus Finnigan could be a client. He might want a tattoo that represents his love for blowing things up, perhaps a small explosion design. Also, Cho Chang could be a client. She might choose a tattoo that is related to her Patronus or something that reminds her of her time at Hogwarts, like a Ravenclaw symbol.
In some 'Harry Potter Harem' fanfictions, a unique idea is to have the 'harem' members be those who have been wronged by the dark side in different ways. They bond with Harry as they all strive for justice and a better wizarding world. For instance, a character whose family was destroyed by Death Eaters joins Harry's group. This creates a deep emotional connection among the group members and a strong motivation for their actions. It also gives a new perspective on the fight against evil in the Harry Potter universe, as they work together not just for Harry's sake but for their own and the world's.