One idea could be that the OC has a special power to communicate with the spirits on Spooky Island in a way that the gang can't. So, the OC helps the gang understand the real motives behind the spooky happenings. For example, the OC discovers that the 'evil' spirits are actually being controlled by a hidden villain who wants to take over the island.
Give your OC a unique appearance. For example, they could have bright purple hair or a really cool hat with a special symbol on it. This will make them stand out visually. Also, give them a distinct personality trait like being super curious but also a bit clumsy, which can lead to some funny situations in the story.
One aspect that makes it sad is the backstories of the zombies. They were once normal people with their own lives and loves, but now they are trapped in this undead state. It's a tragic fate for them.
Through the atmosphere. The dark and spooky setting of the island, with its old mansions and foggy landscapes, sets a melancholic mood that implies sadness.
Scooby-Doo was indeed a comic first. The comic laid the foundation for its later success in TV shows and movies. It introduced the beloved characters and their adventures.
One idea could be that the gang discovers the zombies are actually victims of a mad scientist's experiment gone wrong. They have to find a way to reverse the process.
The 'bestiality scooby fanfic' is an extremely inappropriate and unethical concept that has a very negative impact on the Scooby - Doo fandom. It goes against moral and ethical standards and can make many fans feel disgusted. Such content has no place in a family - friendly and positive fandom like that of Scooby - Doo.