A great concept is the cultural exchange. Ichigo, coming from a different fictional universe, would have different values and a different upbringing compared to the Fairy Tail characters. In a harem setting, this can lead to interesting discussions and changes in the way the characters view things like friendship, loyalty, and love. The female characters in the harem might be intrigued by Ichigo's sense of justice which is shaped by his experiences in the Bleach world.
One interesting 'ichigo fairy tail fanfiction' story could be about Ichigo somehow ending up in the Fairy Tail world and learning magic there. He might team up with Natsu and the gang to fight a powerful dark wizard. Another could involve a crossover of Ichigo's powers with Fairy Tail magic in a unique way, like combining his Zangetsu with a Fairy Tail weapon.
Obviously, Ichigo himself is a central character. From Fairy Tail, characters like Lucy could be part of the harem. Her kind and adventurous nature might be attracted to Ichigo's strength and sense of duty. Erza could also be there, with her strong - willed and powerful personality being drawn to Ichigo's unique abilities. And Wendy, given her gentle and healing nature, might also find herself interested in Ichigo.
One common theme is the fish - out - of - water situation. Since Ichigo is from a different universe (Bleach), his experiences in the Fairy Tail world are often explored. Another theme is the development of multiple romantic relationships. There's also the theme of power - sharing or learning new powers as Ichigo might adapt to the magic in Fairy Tail.
One interesting concept could be creating new magic spells in the fanfiction. Since Fairy Tail is all about magic, coming up with unique spells that fit the universe can be really cool. For example, a spell that combines different elements in a new way, like fire and water to create a steamy mist that can both heal and damage depending on how it's used.
One interesting concept could be the unique power-ups that the characters might get in a gamer - like setting. For example, they could level up their magic skills in a more numerical and visible way, similar to how characters in a game gain experience points.
In Fairy Tail FeelingStamp Fanfiction, the idea of the stamps interacting with different magic types is quite fascinating. Maybe a Fire - type wizard's magic could be enhanced or altered in unexpected ways when combined with a certain FeelingStamp, leading to cool and original battle scenes.
In Fairy Tail fanfiction, one interesting concept could be exploring different relationships between the guild members that were not fully developed in the original. For example, how some of the minor characters interact on a deeper level. In Hellsing fanfiction, a common concept is exploring the backstories of the vampires in more detail, like their lives before being turned. Also, crossovers between Fairy Tail and Hellsing in fanfiction can bring about unique scenarios where the magic from Fairy Tail meets the dark and violent world of Hellsing.
One interesting concept could be a dark version of the Fairy Tail guild. For example, the characters might have their personalities twisted in a nightmare scenario. Maybe Natsu becomes a cold - hearted character instead of his usual warm - hearted self.
Another aspect might be the exploration of different relationships between the characters. Maybe Gray and Erza end up as a couple in some crack fanfictions, which is a departure from the normal relationships in the original Fairy Tail series. It adds a new and unexpected dynamic to the story. These kinds of pairings can lead to really creative and sometimes hilarious storylines.
One interesting concept could be the different forms the boggarts might take in the Fairy Tail universe. They could mimic the powerful magic of the guild members in unexpected ways, adding new and exciting plot twists.