Protagonists:
* Millie Mouse: A bright, curious, and slightly clumsy but well-meaning student who loves exploring and solving mysteries. She could be a bit of a rule-breaker but with a good heart.
* Oliver "Ollie" Cheese: A shy and introverted genius who excels in all subjects but struggles with social interaction. He could have a unique talent or ability that becomes crucial to the adventure.
* Penny "Pepper" Pepper: A fearless and outspoken leader who always stands up for what's right. She could be a bit bossy but has a strong moral compass and a loyal heart.
* Max "Mighty" Mouse: A talented athlete who excels in all sports but is sometimes arrogant and competitive. He could learn a valuable lesson about teamwork and humility throughout the adventure.
Antagonists:
* Professor Nibbles: A grumpy and eccentric teacher who loves rules and regulations and often makes life difficult for students. He could be hiding a secret ambition or harboring a grudge against the school.
* The Shadowy Figure: A mysterious and elusive character who is causing trouble and chaos at the school. They could have a hidden motive or be working for someone else.
* The Spoiled Brat: A wealthy and spoiled student who bullies others and breaks rules without consequences. They could have a change of heart and learn a valuable lesson about kindness and empathy.
* The Jealous Rival: A classmate who is envious of the protagonists' success and tries to sabotage their efforts. They could be motivated by insecurity or a desire for power.
Supporting Characters:
* The Wise Old Librarian: A kind and knowledgeable character who can provide guidance and clues to the protagonists.
* The Friendly Janitor: A helpful and resourceful character who knows the school like the back of his hand.
* The School Principal: A fair and just leader who wants what's best for the students but can be strict at times.
Remember to consider the dynamics between these characters, their individual strengths and weaknesses, and how they will interact with each other to overcome challenges and solve mysteries. You can also incorporate other interesting and unique characters to create a rich and vibrant world for your fabumouse school adventure.