It could start with Finn exploring a strange new area in his world and suddenly stumbling upon a portal. When he steps through, he finds himself in Fionna's world and right in front of her. There's an immediate sense of confusion and curiosity from both of them.
Maybe it starts with Fionna having a strange dream about a boy who looks like Finn. Then, the next day while she's out adventuring with Cake, she actually encounters Finn in real life. She's not sure if she's still dreaming at first, which adds an interesting element to the start of their meeting.
A possible start is that a magical event causes ripples in both Finn and Fionna's worlds. These ripples create a connection between the two, and they start to see glimpses of each other in their respective surroundings. Eventually, the connection becomes strong enough for them to actually meet face - to - face. This build - up of mystery before the meeting can make the story really engaging.
One interesting fanfiction could be where Finn and Fionna meet in a magical forest. They might initially be cautious of each other but then realize they have a lot in common, like their adventurous spirits. They could team up to defeat a common enemy, perhaps an evil wizard who has been causing chaos in both their worlds.
The main characters are clearly Finn and Jake from their own world, and Fionna and Cake from the alternate world. Finn is brave and adventurous, always ready for a fight. Jake is more laid - back but also very loyal. Fionna is a spunky girl with her own set of skills, much like Finn. And Cake, the talking cat, provides comic relief and is also very resourceful, just like Jake in many ways. They are all important as they interact and their stories intertwine in this fanfiction.
The plot might involve Finn and Jake being initially confused by the different gender - swapped versions of themselves in Fionna and Cake's world. Then they learn to work together to solve a mystery that is threatening both of their worlds. It could start with Finn and Jake following a strange portal that leads them to this new place with Fionna and Cake. As they interact, they find that their skills and personalities are both similar and different from their counterparts, which makes for an interesting dynamic.
It could also be a corrupted version of one of Fionna's friends. For example, if Cake were to be turned evil by some dark magic. Cake would know all of Fionna's weaknesses and could use that knowledge against Finn in his Fionna form, making her a formidable and tragic antagonist.
One possible storyline could be Finn exploring the world as Fionna. He might have to deal with the different social dynamics in the female - dominated version of the Adventure Time world. Maybe he'll struggle to fit in at first but then find his own place among the characters like Cake and Prince Gumball.
It could start with Percy getting lost in a strange forest that turns out to be part of the Hunger Games arena. He stumbles upon Katniss who is initially suspicious of him but soon realizes he has some extraordinary abilities.
Finn's personality would probably become more brooding. The whole vampire thing is a big change, and he might start to withdraw a bit. He was always so full of energy and positive before, but now he could be more cautious and a bit more on the dark side. He might also become more territorial, like vampires tend to be.
In a Naruto and Hestia fanfiction, their meeting could also be more planned. Let's say the gods in Hestia's world have been observing Naruto's world and see Naruto as a potential asset. They send Hestia to recruit him. Hestia would approach Naruto gently, explaining the situation. Naruto, always up for a new adventure and a chance to get stronger, would be intrigued. He would then go with Hestia to her world, where he'd start learning about their magic and how to combine it with his ninja skills.
To start writing pitch meeting fanfiction, begin by picking a media property that you're really passionate about. Let's say you love a certain science - fiction series. Next, think about what kind of pitch would have been interesting for that series. You could consider different plot ideas that didn't make it into the actual show. Then, start building the scene of the pitch meeting. Decide who the key players are, like the showrunner, the network executives, and the writers. Describe the room, the atmosphere, and how the pitch is presented. It's all about using your imagination to create a fictional but believable pitch meeting scenario.
First, get to know the characters well. Finn's personality, his values, and his growth throughout Adventure Time are important. Then, think about the concept of the harem. Decide who would be in it and why they are attracted to Finn. For example, you could include Princess Bubblegum because of Finn's heroism.