One idea could be that Cana tries to prove herself worthy of Gildarts' love by going on a difficult quest alone. Another could be that Gildarts, who has always been a bit of a wanderer, finally decides to settle down for Cana. Or perhaps they have to team up against a powerful dark magic that is threatening the Fairy Tail guild and in the process, their feelings for each other deepen.
A possible plot in the fanfiction could be that Cana and Gildarts are forced into a situation where they have to pretend to be a couple for a mission. At first, it's awkward and just for show. But as they face challenges together, like dealing with a group of bandits who are after a valuable magical item, they start to see each other in a new light. Cana admires Gildarts' strength and wisdom, and Gildarts is charmed by Cana's determination and courage. Slowly, their pretend relationship turns into real love.
Well, a great plot could be that Cana discovers Kid has a hidden talent for divination, which is her specialty. So she decides to train him in it. Along the way, they face challenges from other guilds who don't want Fairy Tail to have such a powerful divination duo. They have to work together to overcome these obstacles and prove their worth.
One plot idea could be Bacchus and Cana teaming up for a drinking competition that turns into a magical adventure. As they drink, they start to unlock hidden magical powers within themselves that they didn't know they had. Another idea is a story where Bacchus helps Cana overcome her insecurities about her magic. He could use his own experiences to guide her and in the process, they develop a deep friendship. Or perhaps a plot where they are both on a quest to find a rare magical item that has a connection to their families' pasts.
Definitely include Natsu. His enthusiasm and positive energy can add some light - hearted moments to the story. He could also be the one to accidentally push Cana and Gildarts closer together, like by getting them into a situation where they have to rely on each other. Lucy would also be a good addition. She's a good friend to Cana and can offer a different perspective on love and relationships, having her own experiences in the guild.
A plot could involve Macao and Cana exploring an ancient, forgotten part of Fiore. They stumble upon a hidden treasure, but it's guarded by magical traps. Cana uses her card reading to predict the traps, and Macao uses his strength and fire magic to break through the barriers. Along the way, they could have heart - to - heart conversations about their pasts and dreams in the guild.
One interesting storyline could be Cana's journey to become a more powerful mage. Maybe she discovers a new type of magic or a long - lost spell. Another could be her relationship with the other guild members, like a deeper friendship with Lucy or a rivalry - turned - friendship with Erza. There could also be fanfictions about Cana's past, exploring her family history and how it relates to her magic abilities.
A plot idea could be that Cana is dared to do something embarrassing in the Fairy Tail guild hall as part of a bet. She's hesitant at first but her competitive side takes over. However, things don't go as planned and she ends up in an even more embarrassing situation. Or perhaps she discovers a hidden power within herself while in an embarrassing state. She could be naked in a magical realm where she has to overcome her embarrassment to harness this new power and return to the normal world. This could lead to her becoming a stronger member of Fairy Tail.
Maybe a magical spell goes wrong and makes them see their relationship from a different perspective. They start to notice all the little things they like about each other, like Natsu's determination and Cana's free - spiritedness, which leads to them falling in love.
There are also fanfictions that center around Gildarts' family. Since his relationship with Cana is an important part of the Fairy Tail story, some works explore more about their family ties, like how he became aware of Cana as his daughter and how they build a relationship. Additionally, his role in major Fairy Tail events from a different perspective can be a theme in these fanfictions.
One idea could be a new character arriving at Fairy Hills and having to adapt to the unique living situation. They could face challenges like getting along with the different personalities of the Fairy Tail mages living there.
One plot idea could be a character who has lost their love in a previous battle gets a second chance. Maybe through some magical intervention, they are able to go back in time slightly and change the events that led to their loss. For example, if Gray lost Juvia in a fight, he could be given the opportunity to redo the battle with new knowledge and powers to save her.