To integrate Pokemon into a Friday the 13th - inspired fanfiction, you can start with the idea of curses or hexes. A Pokemon could be cursed on Friday the 13th, which changes its appearance or abilities in a negative way. For example, a Bulbasaur's plant parts might wither and its attacks become weaker. You can also make use of the number 13. There could be a group of 13 rare Pokemon that are only seen together on Friday the 13th. Additionally, Pokemon could be involved in solving the mysteries that come up on this day. For instance, a trainer and their Pokemon team have to figure out why strange things are happening in a particular forest that is always calm except on Friday the 13th.
One common theme could be the idea of superstition. Since Friday the 13th is considered unlucky in many cultures, in a Pokemon fanfiction, trainers might experience strange and unlucky events during their Pokemon journeys. For example, their Pokeballs might malfunction more often or they might keep running into wild Pokemon that are unusually aggressive. Another theme could be mystery. There could be a mystery Pokemon that only appears on Friday the 13th and has some special power or connection to an ancient legend. Also, themes of courage in the face of the unknown are likely. Trainers would have to overcome their fear of the unlucky day and whatever strange things are happening to them and their Pokemon.
The Akatsuki members in Naruto could also be incorporated. For example, they could be after the corpse bride for her unique chakra or some hidden secret she holds. Naruto would then have to protect her while also trying to find a way to return her to peace. Each Akatsuki member would bring their own set of skills and motives, adding more complexity to the fanfiction story.
First, decide which two or more universes you want to cross over. For example, if it's 'Friday the 13th' and 'Alien', think about how the two different types of horror can blend. Then, introduce the setting. If it's at Camp Crystal Lake, describe the spooky atmosphere. Next, bring in the characters. Start with a character from one of the universes, like Ripley from 'Alien' arriving at the lake. Then, build the conflict. Maybe there are strange alien - like creatures emerging from the lake, and Ripley has to team up with Jason (in a strange way) to face this new threat.
Naruto's Rasengan would be a very effective weapon in the Friday the 13th universe. He could use it to blast away any threats, like the masked killers or other dangerous creatures. His ability to create shadow clones would also be useful for scouting the area, as the Friday the 13th settings are often full of hidden dangers. He could send clones in different directions to look for exits or other survivors.
One idea could be a crossover with 'Nightmare on Elm Street'. Freddy Krueger could invade the 'Friday the 13th' world and start terrorizing the campers. Jason Voorhees would then have to face this new threat. It could be an epic battle of two horror icons.
There's also 'Jason and the Newcomer'. In this fanfiction, a new character arrives at Camp Crystal Lake with a mysterious past. This character seems to have an uncanny ability to sense Jason's presence. The story delves into their strange connection and how it affects the events at the camp.
It's hard to give an exact number. There have been multiple series and special editions over the years. But you could try checking dedicated comic book databases or fan forums for a more accurate count.
Love and blood are often in contrast. The blood represents the violence and death that is so common in Friday the 13th scenarios. Love, on the other hand, can be the force that tries to resist this. For example, a character's love for their friend might make them risk their life to save them from a bloody end at the hands of Jason.
For the Pokemon characters, you can give them human - like emotions and insecurities similar to the characters in Fruits Basket. For example, a Charmander could be shy about its small flame and be afraid of being rejected. Trainers can be developed by giving them backstories that mirror the complex family relationships in Fruits Basket, like having a trainer who has a strained relationship with their family but finds a new family among their Pokemon team.
The love triangle in Friday the 13th fanfiction can be really engaging. It might be that one character is in love with a potential victim and the killer in some strange way. Maybe the killer has a hidden side that draws the character in, while the victim represents safety and normalcy. This can lead to some really tense situations as the character has to decide who to side with, all while the threat of Jason Voorhees looms.