A fanfiction could focus on Oscar's attempts to teach the hedgehog some of his favorite camp activities. For example, he tries to show the hedgehog how to make a perfect s'more. But the hedgehog has its own ideas and ends up creating a new kind of treat using its spines to hold the ingredients in a unique way. It could be a cute and humorous story about their different approaches to having fun at the camp.
One idea could be that Oscar discovers a hidden ability of the hedgehog. Maybe the hedgehog can communicate with the spirits of the island at night. Oscar then teams up with the hedgehog to solve a mystery that has been plaguing the Summer Camp Island, like why some parts of the forest are always in a strange mist. This could lead to an adventure filled with magic and friendship.
In this fanfiction, the hedgehog could get lost in a strange part of the island. Oscar, worried sick, sets out on a journey to find it. Along the way, he meets various magical creatures who either help or hinder his search. When he finally finds the hedgehog, they realize that they have a special bond that can overcome any obstacle on the Summer Camp Island.