Apoorv Circus Greetings & Welcome to Microsoft Q&A forum!
I'm also getting the same error as response. Did you try adjusting the severity levels?
I understand that it is not intended behavior. If Azure OpenAI recognizes your prompt as harmful content, it doesn't return a generated image. For more information, see Content filtering and adjust the Severity.
The word "Goku" is triggering content filter. Can you try modifying the prompt and see if that works.
Do let me know if that helps.