Perhaps in the fanfiction, Nico gets the puppy as a gift from a mysterious figure. The puppy is a special breed that is only known in the demigod world. Nico has to learn how to take care of this unique puppy. He has to figure out what it eats, how to train it, and also how to protect it from the various dangers that lurk in his world.
Another possibility is a monster that is attracted to the puppy's pure and innocent energy. This monster sees the puppy as a source of food or just something to torment. Nico has to fight off this monster to protect his new furry friend.
Well, it could be about Nico Di Angelo using his underworld powers to help the Avengers in a battle against a powerful villain who has the ability to raise the dead. Maybe he teams up with Doctor Strange to close portals to the underworld that the villain is using to summon hordes of zombies.
One possible plot could be that Nico somehow gets transported to the Harry Potter world. He might use his powers from the Percy Jackson universe, like shadow - traveling, to his advantage in the new magical world. Maybe he helps Harry and his friends in their fight against Voldemort by providing unique strategies based on his own experiences with battles in his own world.
One possible theme could be friendship. Maybe his friends are tickling him as a form of play or to cheer him up. Another theme might be vulnerability. Since tickling can make a person seem more vulnerable, it could show a different side of Nico di Angelo.
Well, the plot could involve Nico using his powers from the Percy Jackson universe to help the Avengers in a battle. Maybe he could use his shadow - traveling ability to surprise enemies or transport the Avengers quickly. It would be really cool to see how he'd interact with the different personalities in the Avengers team, like Tony Stark's sarcasm or Captain America's leadership.
One possible plot could be that Nico di Angelo somehow gets transported to the wizarding world. He might initially be seen as a strange outsider with his unique powers from the demigod world. Maybe he teams up with Harry Potter to face a new kind of dark magic that combines the elements of the demigod and wizarding threats. For example, a villain who has found a way to use both the magic of the Underworld and the dark arts.
A great plot could be centered around a prophecy that involves both Nico and Sirius. They are brought together by this prophecy which predicts that only by combining their powers can they save both the demigod and wizarding worlds. Along the way, they have to deal with people who don't trust their alliance, like some of the demigods who think wizards are too different and some wizards who are scared of Nico's connection to the underworld. But they persevere and fulfill the prophecy.
I'm not sure of specific 'nico di angelo gets tickled fanfiction' titles off the top of my head. You could try searching on fanfiction platforms like Archive of Our Own. They usually have a wide range of fanfics, and you can use the search bar to look for ones related to this specific scenario.
In a fanfiction where Nico di Angelo meets Dumbledore, there are numerous possibilities. Nico might be initially distrustful of Dumbledore, given his own experiences with authority figures. However, Dumbledore's calm and kind demeanor could gradually break down Nico's walls. Dumbledore could introduce Nico to the wonders of the wizarding world, such as spells and magical artifacts. Nico, in turn, could show Dumbledore some of his demigod abilities, like shadow - traveling. Their meeting could also lead to a cultural exchange of sorts, with Nico learning about Hogwarts and Dumbledore getting a peek into the life of a demigod.
In such a fanfiction, there could be an epic battle. Nico's powers from the Percy Jackson universe might clash with the Winchesters' hunting skills. Maybe they initially misunderstand each other, thinking the other is a threat. But then they could realize they are all fighting against some form of evil and team up. For example, Nico could use his ability to control the dead to help the Winchesters deal with a horde of zombies, while the Winchesters could teach Nico some of their combat tactics against demons.