For a Fairy Tail Mard Geer fanfiction, Mirajane could be an excellent character to pair with him. Mirajane has her own dark past and her demon powers which could relate to Mard Geer in some ways. Their interactions could be full of mystery and tension. Laxus is another one. Laxus' brash and powerful personality would clash with Mard Geer's, creating a story full of action and power struggles. Additionally, Cana could be paired with Mard Geer. Cana's laid - back but also cunning nature could play off well against Mard Geer's more serious and evil demeanor.
One interesting plot idea could be exploring Mard Geer's past before he became a major antagonist in Fairy Tail. Maybe he had a relationship that was torn apart by the dark forces he later embraced. Another could be a what - if scenario where Mard Geer is redeemed and has to face the consequences of his past actions among the Fairy Tail guild members. A third idea is a fanfiction set in an alternate universe where Mard Geer is a hero instead of a villain, fighting against an even greater evil that threatens the world of Fairy Tail.
The OC's character can develop through conflict with Mard Geer. For instance, if Mard Geer attacks the OC's hometown in the fanfiction, it could fuel the OC's determination to become stronger and seek revenge. This would shape the OC into a more resilient and vengeful character.
In fanfiction, the relationship between Mard Geer and an OC can be quite diverse. It could be a relationship of enmity, where the OC stands against Mard Geer's evil plans in the Fairy Tail universe. Maybe the OC is a mage with unique powers that directly oppose Mard Geer's dark magic.
One possible aspect of a Fairy Tail Natsu and Tartaros fanfiction could be Natsu's battle against the powerful foes in Tartaros. He might face new and terrifying enemies that test his limits. His dragon slayer magic would be put to the extreme, and perhaps he discovers new powers along the way.
One great 'Fairy Tail Tartaros' fanfiction is 'Tartaros' Redemption'. It focuses on a Tartaros member who starts to question their evil ways after interacting with Fairy Tail members. It has some really interesting character development and a unique take on the relationship between the two groups.
Natsu could end up teaming up with some unexpected allies from Tartaros. Maybe there are some members who have a change of heart and decide to help Natsu fight against the more evil elements within their own organization.
Another reason is the large and passionate fan base of 'Fairy Tail'. Fans love to create their own versions of the Tartaros story. They can introduce new magic, new relationships, and new plotlines. The fanfictions often provide a fresh perspective on the well - known Fairy Tail universe, which is always exciting for both the writers and the readers.
For a Fairy Tail Tartaros Arc fanfiction, you might consider writing about a new magic that is introduced during the arc. It could be a magic that is a combination of different existing magics in the Fairy Tail universe. The story could revolve around a young wizard who discovers this new magic and uses it to turn the tide in the battle against Tartaros. You could also explore how the discovery of this new magic affects the power dynamics within the guild and among the other characters in the arc.