Maybe in the Squalo back story, his relationships also play important roles. His interactions with other members of the Varia could be a key part. For example, how he competed or cooperated with them. These relationships might have influenced his development and actions throughout the story.
Another possibility is that Squalo is a character from a local or less - known story. Without more details, it's difficult to fully explain the back story. It could be a name in a fantasy novel where Squalo is a hero or a villain, with a back story involving magic, quests, and personal growth or downfall.
One interesting 'Harry Potter Squalo' fanfiction could be one where Squalo is introduced into the Hogwarts world and has to adapt to the magic there. Maybe he becomes a student and tries to learn spells, which would be a really fun and unique take on the Harry Potter universe.
I've read one where Squalo is a transfer student to Hogwarts. He brings his own unique fighting skills and a different kind of magic knowledge. It's really interesting to see how he interacts with the other students like Harry, Hermione, and Ron. He gets into all sorts of adventures and even helps in a big battle against a group of dark wizards that were trying to take over the school.
A caricature of spaghetti might have exaggerated shapes and proportions. The strands could be drawn really thick or really thin and in wacky positions.
A cartoon girl playing hockey can be very interesting. She might face challenges but overcome them with her passion and talent. Her moves could be exaggerated for effect, making it visually appealing and full of action.
You might be able to find it on some popular manga reading platforms or websites. Just do a quick online search and you'll likely come across a few options.