Well, start with a concept. Maybe your oc has a special ability that draws Ann's attention. Then, build their relationship gradually. Don't rush into making them fall in love right away. For the setting, use the locations from Persona 5 such as Shujin Academy. When writing the dialogue, make sure it sounds natural for both characters. Ann has a certain way of speaking, so your oc's dialogue should also match the tone of the story. Also, add some action scenes from the game, like battles with Shadows, to make it more exciting.
There are many great authors. One popular one might be those who have a deep understanding of the Persona 5 universe. For example, some authors who have played the game multiple times and really grasped the personalities of Joker and Ann. They can write in a way that feels true to the characters.
One interesting plot could be Joker and Ann going on a secret mission outside of the Metaverse. They face various real - world challenges that test their relationship and skills. For example, they might have to infiltrate a high - security building to gather information related to a new threat that's linked to the Metaverse somehow.
I really like 'The Unlikely Pairing'. It's a fanfiction where the oc is an artist who meets Ann at an art exhibition. Their relationship starts off rocky but slowly blossoms. It has some really interesting dialogue exchanges that show the chemistry between the two characters. It also delves into the world of Persona 5 in a unique way through the eyes of these two characters.
Makoto is often very level - headed and she can act as a stabilizer in the group. When Akira comes up with a risky plan in the Metaverse, Makoto might be the one to point out the potential flaws and suggest improvements. Ann, on the other hand, is more carefree and might encourage Akira to be a bit more daring. For example, when they are exploring a new Palace, Ann could be the one to say 'Let's just go for it!' while Makoto would say 'Wait, we need to think this through first.'
One possible storyline could be the three of them teaming up for a special heist in the Metaverse. They might use their combined Personas' powers in unique ways to overcome the Shadows. For example, Makoto's strategic mind, Akira's leadership, and Ann's charm could all play important roles in infiltrating a difficult Palace.
The 'Rebel Hangout' in high school story could be a place where the rebellious students gather. It might be a corner of the schoolyard, an abandoned classroom, or some other secluded area where they can be themselves, away from the more conformist parts of the school environment.
Silom is a well - known area for gay hangouts. There are lots of bars and cafes there. Another place could be Sukhumvit which also has some gay - friendly establishments.
Seashell Haven. The name makes you think of a place where seashells are abundant, perhaps a little beach shack or a cove filled with beautiful shells. It's a place where friends can gather and enjoy the seaside beauty.