This sounds like a fun and adventurous mix of mystery, suspense, and camaraderie! Combining elements from Five Nights at Treasure Island with original characters creates an interesting dynamic, and the plot could have plenty of exciting moments.

Here’s a structured summary for your book idea, "Treasure Island and Weird Adventures":

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Title: Treasure Island and Weird Adventures

Genre:

Adventure, Mystery, Horror, Friendship

Main Characters:

1. Jonathan (Blue shirt with a "J")

The sensible leader of the trio. Jonathan is brave and level-headed, always looking for solutions in chaotic situations.

2. Ricky (Red shirt with an "R")

The fun-loving, energetic one who is always ready to jump into any situation, even if it’s a little reckless.

3. Isaac (Green shirt with an "I")

The intellectual of the group. Isaac’s curiosity and problem-solving skills make him a valuable asset when things get tricky.

4. The Five Nights at Treasure Island Characters

These are the eerie animatronics from the Five Nights at Treasure Island universe. They are old, creepy, and seemingly hostile at first, but later become unexpected allies.

5. The Co-workers

They are the antagonists of the story, a group of sinister characters who run an animatronic place and kidnap the Treasure Island characters.

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Plot Summary:

Act 1 – The Crash and Discovery:

Jonathan, Ricky, and Isaac are traveling to Disneyland for a fun vacation, but when their plane crashes, they find themselves stranded on an island called Discovery Island.

This island, abandoned for years, is filled with old and forgotten Disney mascots. The trio explores the mysterious, overgrown land, discovering creepy, long-neglected animatronics that seem strangely lifelike.

As they investigate, they encounter the Five Nights at Treasure Island animatronics—characters like Mickey, Goofy, and others that have been abandoned and are now corrupted and eerie. At first, the animatronics scare the group, but after some tense moments, they begin to communicate and even form an uneasy alliance with the trio.

Act 2 – The Kidnapping and Chase:

Just as things seem to settle down, the group is ambushed by the Co-workers, a group of sinister employees who secretly run an underground animatronic operation. They kidnap the Treasure Island animatronics and take them to a dark, hidden animatronic warehouse.

Jonathan, Ricky, and Isaac, with their newfound animatronic allies, realize they need to rescue them from the Co-workers. The group sets out for the warehouse, sneaking in under the cover of night.

Act 3 – The Rescue and Battle:

The trio navigates the dark, eerie warehouse filled with malfunctioning animatronics. The Co-workers soon discover they’re being infiltrated and a battle ensues.

In a tense and thrilling showdown, Jonathan, Ricky, and Isaac team up with the now-activated Five Nights at Treasure Island animatronics to fight the Co-workers and free them from their control.

During this fight, the animatronics come alive in ways they hadn’t before, showing their true loyalty to their new friends.

Act 4 – The Triumph and Return:

After a fierce battle, the Co-workers are defeated and taken into custody. The animatronics are freed, and the group manages to escape the warehouse with the help of the Five Nights at Treasure Island characters.

The trio and their new animatronic allies return to Discovery Island and decide to bring the island back to life. They work with Disneyland to reintroduce the forgotten park into the theme park system, turning it into a new attraction.

Act 5 – The Happy Ending:

Discovery Island is revived and becomes a new, beloved part of Disneyland, with the animatronics restored to their former glory, no longer creepy but now friendly and part of the park's new show.

Jonathan, Ricky, and Isaac return to Disneyland, their adventure having come to a close with new friends and a sense of accomplishment. The animatronics now have a purpose, and the trio has made sure the island is safe once more.

The story ends with the park’s grand reopening, with everyone celebrating their hard-won victory.

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Themes:

Friendship and Teamwork: The characters must work together, learning to trust one another, despite their differences and fears.

Bravery in the Face of Fear: Facing creepy, dangerous animatronics and the sinister Co-workers, the group learns that courage comes from within.

Redemption: The animatronics, once scary and abandoned, find new purpose and life when they are treated with respect and kindness.

Tone and Style:

Adventure and Suspense: The story will have a blend of lighthearted moments (the trio’s antics) and darker, more suspenseful scenes (encounters with the animatronics and Co-workers).

Humor and Horror: The dynamic between the human characters and the creepy, outdated animatronics provides room for both humor and scares. The animatronics’ interactions with the humans can be both funny and eerie.

Mystery and Discovery: The island and the animatronic warehouse hold secrets, and the characters must solve the mystery to save the day.

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Conclusion:

This book blends the world of Five Nights at Treasure Island with an original group of characters in an adventure full of mystery, danger, and unexpected friendships. By the end, the characters save both their new animatronic friends and the long-forgotten Discovery Island, bringing it back to life as a new part of Disneyland.

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How does that sound? Do you want to dive deeper into any specific part of the story or add new twists? Let me know how you'd like to proceed!