1. Real: This is the most straightforward opposite of fictional, meaning something that actually exists or happened.
2. Factual: This emphasizes the truthfulness and accuracy of something, contrasting with the made-up nature of fiction.
3. Non-fictional: This is a direct opposite of fictional, used in specific contexts like categorizing literature as non-fiction.
4. True: This is similar to real and factual, emphasizing the authenticity of something.
5. Actual: This implies a concrete existence, contrasted with the imagined nature of fiction.
The best word to use will depend on the specific situation and the nuances you want to convey.