Preston Waters is a fictional character from the 1994 family film, Blank Check. In the movie, he is a young boy who receives a blank check and uses it to fulfill his wildest dreams, leading to various adventures and mischief. The story explores themes of childhood imagination and the consequences of wealth. As Preston navigates his newfound fortune, he learns valuable lessons about responsibility and friendship, making the film a lighthearted yet meaningful tale for audiences of all ages.