There could be. The idea of mixing 'Harry Potter' and 'Scorpion King' in fanfiction is quite unique. However, finding really good ones might take some time. You should search for tags related to both on fanfiction platforms. It's possible that some writers have created crossovers where characters from both universes interact in unexpected and exciting scenarios.
In this fanfiction, Harry's development could be centered around his understanding of family. Growing up with a scorpion, he has a very different concept of what a family is. This could lead to him having a complex relationship with the Weasleys or other surrogate families in the wizarding world. He might be hesitant to accept their love and care at first, but gradually come to realize the value of a real family. Also, his magical development could be more instinctive, like how a scorpion reacts instinctively to threats, Harry might use magic in a more impulsive yet effective way when in danger.
I recommend 'Scorpion's Magical Adventure in Hogwarts'. It has an interesting plot where Scorpion discovers his magical abilities in the world of Harry Potter and has to navigate through the challenges of Hogwarts life while also hiding his true identity.
A frequent theme is power. How the power in the Harry Potter universe, like magic, interacts with the power dynamics in the Scorpion King's world, such as his leadership and combat skills. Also, there could be a theme of mystery. Writers might explore the mysteries of both worlds, like the secrets of Hogwarts and the hidden knowledge in the Scorpion King's realm, and how they are connected.
Perhaps in this fanfiction, the scorpion - raised Harry has a very different relationship with Hogwarts. He might be more of an outcast due to his strange upbringing, and has to fight harder to prove himself worthy of being at the school. His knowledge of the wizarding world might be different too, as the scorpion may have taught him some unorthodox ways of using magic.
One interesting Harry Potter Scorpion fanfiction could be about Scorpion being a secret protector of Hogwarts. He uses his unique skills to fend off dark forces that are trying to infiltrate the school.
One idea could be a crossover where Harry Potter and his friends accidentally end up in the world of The Scorpion King. They could use their magic to help the Scorpion King in his battles against his enemies. Maybe Harry could use his invisibility cloak to spy on the enemy's plans and then use spells like Stupefy to stun them during the fight.
Well, it could work by having a magical portal connect their two worlds. For example, Hermione might be studying ancient spells and accidentally opens a portal to the world of The Scorpion King. Then, they have to figure out how to get back home while also getting involved in the local politics and battles there.
One great 'Naruto Scorpion Fanfiction' is 'The Redemption of Scorpion'. It delves into Scorpion's past and his possible path to redemption within the Naruto universe. The story is full of emotional moments and great character development.
One possible fanfiction could be about a new character in the Naruto universe who discovers a unique way to summon Scorpions. They might use these scorpions for combat or for gathering information. For example, the character could be from a hidden village that has a special connection to scorpions, and they use this to their advantage in battles against other ninja.