In some fanfictions, Frederick Chase might be in a situation where he is in trouble and Percabeth has to come to his rescue. This could lead to a whole new level of understanding between them. For example, Frederick could be captured by an enemy who wants to use him as bait to lure Percabeth. When Percabeth saves him, he realizes just how brave and resourceful they are as a couple. And perhaps this event also makes Frederick more involved in their lives and more accepting of their relationship.
Maybe Frederick Chase discovers a hidden prophecy that involves Percabeth and his own role in their journey. So he has to guide them in a way he never expected. Along the way, he learns more about their relationship and how strong their bond is. This could involve them facing some new and dangerous monsters, and Frederick having to use his skills and knowledge to help them out. It could also be a story where Frederick has some secrets from his past that are somehow related to Percabeth's future, and as they meet, these secrets start to unfold.
A possible plotline could be that Frederick Chase, being Annabeth's father, is initially hesitant about Percy. But as he gets to know Percy better during a quest they all end up on together, he starts to see Percy's good qualities and gives his blessing to Percabeth.
One place to start looking for 'frederick chase meets percabeth fanfiction' could be on Archive of Our Own (AO3). It has a large collection of fanfictions, and you can search for specific tags like 'frederick chase' and 'percabeth' to find relevant stories.
A really cool plotline could be a time - travel scenario within the fanfiction. Magnus Chase and the Seven get sent back in time to a crucial moment in Norse mythology. They have to make sure the events play out correctly without changing history too much, while also finding a way to bring something back from that time period to help them in their present - day struggles against their enemies.
One possible plotline could be Percy and Annabeth trying to balance their high school lives with taking care of the baby. They might face challenges like hiding it from their parents or dealing with schoolwork while also being new parents. Another could be how their friends react to the situation. Some friends might be supportive, while others might be judgmental.
One possible plotline could be that Atreus and Calliope meet in a magical forest. Atreus is on a quest, and Calliope is there seeking inspiration. They initially misunderstand each other but then gradually come to respect and help one another on their respective journeys.
One possible plotline could be that the city girl, Annabeth perhaps, visits the country for some reason, like a school project or to visit relatives. There she meets the country boy, Percy. They start off not getting along because of their different backgrounds, but as they spend more time together, they discover they have more in common than they thought and fall in love.
One possible plotline could be that they are in the middle of a dangerous mission in the 'monsuno' world. Jinja and Chase have been through a lot together, and in a moment of relief after narrowly escaping danger, they share a passionate kiss.
One plotline could be that they face danger from an old enemy who sees the unborn child as a threat. So they have to protect themselves and the baby. Another could be that Annabeth has some premonitions about the baby's future and they embark on a quest to understand what it means.
One possible plotline could be that Chase gets hurt during a mission while trying to protect his siblings. Maybe he takes a hit that was meant for Bree or Adam, and then has to deal with the physical and emotional aftermath. His siblings could feel guilty and try to overcompensate in taking care of him.
Another possible plotline is the seven and Percabeth getting transported to a completely different realm, like a parallel universe where things are both familiar and strangely different. They would have to figure out how to get back home while also dealing with the unique challenges of this new world. This could involve making new allies and enemies, and exploring different cultures within this parallel universe.
There could also be a plotline where there is some sort of danger threatening the Pride Lands. Kovu and Mufasa, despite their differences, team up to face this threat. Kovu brings his unique skills and knowledge from his pride, and Mufasa uses his wisdom and leadership. As they work together, they develop a mutual respect for each other that was not there before.