The 'Goonies Novel' is likely about the adventures of a group of kids, probably filled with mystery, treasure hunting and friendship. Just like the movie, it might tell the story of the Goonies as they face various challenges and try to achieve a certain goal.
In 'the goonies novel', Mikey is a very determined character. He is the one who really pushes the group to go on the adventure in search of the treasure. Brand is more cautious at first but his loyalty to his friends and brother makes him join in. Chunk provides a lot of the comedic relief with his clumsy and sometimes cowardly actions. Mouth is great at getting them out of tough situations with his fast - talking. And Data, his inventions are not only cool but also very helpful during their journey.
Definitely not. The Goonies is a fictional tale. It was crafted to give viewers a thrilling and fun experience, not based on any real events or people.