Here's why:
* Copyright: Characters, stories, and even the settings of a book are protected by copyright law. This means the creator (the author or the studio that owns the rights) has exclusive rights to use them.
* Legal Issues: Using a character without permission is a copyright infringement, which can have serious legal consequences, including lawsuits and financial penalties.
What you can do instead:
* Create your own characters: This is the best way to avoid any legal trouble. Unleash your creativity and come up with original characters, stories, and worlds.
* Get permission: If you absolutely want to use an existing character, contact the copyright holder (the author or studio) and ask for permission. This might involve paying a licensing fee or agreeing to specific terms of use.
* Parody and Fair Use: There are some exceptions to copyright law, like parody and fair use. However, these are very specific and require careful legal consideration.
Remember: It's always best to be safe and respect copyright law. By creating your own characters, you can build a unique and original story that truly reflects your vision.