In a crossover, the interactions could be really diverse. A Persona character with healing abilities could befriend Ann, who could learn some new self - care techniques from them. Ryuji might find a kindred spirit in a more brash Persona character, and they could get into all sorts of trouble together while also having each other's backs. Joker, being the adaptable one, would be the bridge between the two groups, making sure everyone gets along and working towards a common goal, whether it's defeating a big bad or just exploring the new - found connection between their worlds.
Some characters might not get along so well. For instance, a more serious Persona character might find Joker's carefree attitude a bit off - putting. However, as they face challenges together, they would start to understand and respect each other. The Persona characters could introduce Joker and his friends to the concept of the Collective Unconscious in more detail, and the Phantom Thieves could show them how to use their skills in a more urban, modern - day setting. There would be a lot of banter and friendly competition between the two groups as they learn from each other.
The characters would likely have a mix of admiration and friendly rivalry. For example, the cool and collected protagonist of Persona 5 might be intrigued by the more laid - back nature of the Persona 4 protagonist. Meanwhile, the Persona 3 protagonist, with his more somber and serious demeanor, could initially seem a bit intimidating to the others. But as they get to know each other, they would start to bond over their shared experiences of fighting Shadows and protecting their worlds.
The characters would likely be initially cautious. For example, Yu from Persona 4 might be a bit reserved when meeting Joker from Persona 5, but as they learn about each other's goals, they would start to trust. Yosuke might be excited to see the more high - tech Metaverse compared to the TV World, and he could bond with Ryuji over their shared love for adventure. Chie would probably challenge Ann to a fight at first, thinking she's just a pretty face, but then realize Ann's strength.
A great storyline might involve a fusion of the two worlds' mechanics. For example, the Velvet Room from Persona could have some connection to Joker's world. The Igor-like figure could offer Joker and his friends some new kind of power or knowledge that they use to combat a common foe. Or perhaps the Persona characters learn about Joker's Metaverse Navigator and try to replicate it in their world, which leads to all sorts of unforeseen consequences and adventures.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Persona 5 Joker crossover fanfics. Just use the search function and type in 'Persona 5 Joker crossover'. Another option is FanFiction.net. There are also some dedicated Persona 5 fan communities on social media platforms where fans might share their favorite crossover fanfics.
One popular pairing is Joker with characters from the Persona series like Akechi. Their complex relationship in the game makes for interesting crossovers. Another is Joker with characters from other RPGs, such as Link from The Legend of Zelda. It's cool to see how their different abilities and personalities interact. Also, Joker and characters from the Final Fantasy series like Cloud are quite popular.
I really like Yu Narukami from Persona 4 in the crossover. He brings his calm and collected leadership from his own game. His ability to analyze situations and keep the group together is really cool when he's interacting with the Persona 5 characters.
Joker, the main character of Persona 5, might be initially cautious around Kirby. Kirby's round and friendly appearance might make Joker lower his guard after a while. He could then show Kirby how to use a Persona, if Kirby was interested.
Ruby would likely be very confused at first. She's used to fighting Grimm and more straightforward villains. The Joker's erratic behavior and mind - games would be a new and challenging thing for her. She'd probably try to understand his motives and find a way to stop him from causing more harm. Weiss would be distrustful right away. She's from a high - society family and the Joker's unruly nature would be completely opposite to what she's used to. She might see him as a threat not just to the world, but also to the order she values.
The other Phantom Thieves are very common. Characters like Ryuji, who is brash and energetic, often appears alongside the female Joker. Morgana, the cat - like guide, is also frequently in fanfictions with her. And Ann, with her model - like looks and strong will, is another common supporting character.
Harry would likely be very suspicious of The Joker from the start. He's used to dealing with threats in his own world, and The Joker's erratic behavior would set off alarm bells. Hermione would probably try to study The Joker, looking for a logical explanation for his actions and a way to counter him. Ron, on the other hand, might be a bit more fearful at first but would still stand by his friends. They would initially approach The Joker with caution, trying to figure out if he has any magical abilities or if he's just a very strange Muggle who has found his way into their world.