Perhaps Erza is transported to a parallel world where the rules are different. In this world, she finds herself naked and embarrassed, but she discovers that the 'M' aspect has some connection to a power source that can help her get back to her own world. The story could explore her journey of self - discovery and adaptation in this strange new place.
Another plot could involve a spell gone wrong that causes Erza to be in a state of undress in a public area in the Fairy Tail world. She then has to deal with the embarrassment while also facing a new threat that has emerged during this chaos. The story could focus on her regaining her composure and dignity while solving the problem.
Perhaps Wendy could be under a spell that makes her think she's invisible but in reality she's not, and she unknowingly walks around naked in front of the Fairy Tail guild. This would cause great embarrassment for her. The story could then focus on how she discovers the truth and how the guild members react in a humorous yet supportive way.
One plot idea could be that Mira gets caught in an embarrassing situation during a Fairy Tail event. For example, she accidentally casts a spell wrong and her clothes disappear just as an important guest arrives. Another could be that she is forced to participate in a contest where she has to show a hidden talent, but she's embarrassed about it. Maybe she has to sing in front of everyone when she thinks she's a bad singer.
One plot idea could be that Kagura finds herself in an embarrassing situation in a magical forest. Maybe she loses her clothes due to a spell gone wrong. As she tries to find a way to get them back, she has to interact with various Fairy Tail characters, leading to humorous and heartwarming exchanges. For example, she might encounter Natsu who, in his typical clueless way, doesn't quite understand her distress at first but then tries to help.
Erza could be developed by showing her vulnerability. Usually, she is very strong and composed. But in this situation, her being embarrassed and naked makes her more human. We can explore how she overcomes her insecurities and uses her inner strength.
One popular theme could be Erza's growth and self - discovery. In many fanfictions, her journey from being embarrassed about certain situations to becoming more confident is explored. For example, she might face challenges in her relationships within the Fairy Tail guild that initially make her feel naked in an emotional sense, like being vulnerable when dealing with her feelings for a certain character. Another theme could be her strength in the face of embarrassment. Erza is known for her tough exterior, but fanfictions might play with the idea of how she overcomes internal struggles related to being embarrassed while still maintaining her position as a powerful mage in the guild.
Maybe in a fanfiction, Wendy is put under a spell that makes her think she's invisible but in reality, she's actually naked. She goes about her day in Fairy Tail, oblivious to her state, and gets into all sorts of embarrassing situations. For example, she might walk into a meeting of the guild leaders in that state. When she finally realizes, she's extremely mortified but her friends help her through it.
One possible plot idea could be Levy getting caught in an embarrassing situation during a Fairy Tail mission. For example, she might accidentally lose her clothes due to a magical mishap while trying to solve a riddle in an ancient ruin. This could lead to her being very embarrassed but also relying on her friends' support to get through it.
One idea could be Juvia getting caught in an embarrassing situation during a Fairy Tail mission. For example, she might accidentally use her water magic in a way that makes her clothes wet and she feels extremely self - conscious, leading to some comical and heart - warming interactions with the other guild members as they try to comfort her.
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.
A common type of storyline is one where Erza has to protect the Fairy Tail guild from a powerful and mysterious enemy. She uses her unique magic and her leadership skills to rally the guild members. In some fanfictions, this might also involve her making sacrifices for the greater good of the guild. And there could be sub - plots about her relationships with other members, like how she mentors the younger mages in the guild.