The Tickle Monster in a Tickle Stories is likely a fun and imaginative character. It might be a creature that loves to tickle others, creating humorous and light - hearted situations in the stories.
Gumball is sure to be one of the main characters, as it's in his name. His family members like Darwin and Anais are also very likely to be main characters.
One plot idea could be that Gumball loses his braces and has to go on a wild adventure to find them before his next orthodontist appointment. Maybe they got accidentally mixed up with Darwin's fishbowl accessories and are now at the bottom of the ocean.
Since it's a fanfic, it may also bring in elements that the fans have always wanted to see. It might give Gumball some superpowers or put him in situations where he has to make really tough moral choices. The new gumball fanfic could be a great opportunity to see the world of Gumball from a different perspective, with new settings, new conflicts, and new ways for the characters to interact.
Maybe it's one of the school bullies who got hold of a magic book and decided to play a prank on Gumball by casting a love spell. They thought it would be funny to see him act all lovey - dovey, not realizing the chaos it would actually cause.
A more dramatic fanfiction could involve Marshall getting into some trouble with a group of bullies. Gumball, being the loyal friend, comes to his rescue. But in the process, they both learn some valuable lessons about standing up for themselves and the importance of friendship.
In most of these fanfictions, the tickle monster is often very mischievous. It likes to play pranks on the characters, especially the main ones like Sam and Dean. It usually has some sort of supernatural ability related to tickling, like being able to make its victims completely immobile while tickling them.
An interesting character interaction could be between Gumball and the school bully. The bully could make fun of Gumball's braces, but Gumball uses his quick wit and the braces as a sort of weapon. For example, he could shine the braces in the bully's eyes to temporarily blind him and make his escape. This would show Gumball's resourcefulness and also how the braces can be an unexpected asset.