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That is a bad idea, and yes, it is possible you can be sued for damages. Other fictional characters are somebody else's work, as a general rule you cannot steal them. Those authors have the right ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/39113 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/39113 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
### That is a bad idea, and yes, it is possible you can be sued for damages. Other fictional characters are somebody else's work, as a general rule you cannot steal them. Those authors have the right to any profits earned by those characters in any way. They also have the right to control how their characters are portrayed, described, or made to act. There are some exceptions about characters that are not well-developed, but you will have to talk to a lawyer to see what you can get away with. If you intend to publish, agents and publishers will reject a work containing some other author's characters. You could self-publish, but then you open yourself up to a lawsuit. Think of other fictional characters as items of property like a car, you cannot just take it and use it, **especially** to make money, without the owner's permission.