A hero acting for a kid's birthday party in Hong Kong can add a fun and exciting element to the celebration. The hero can dress up in a costume and act out scenes from popular movies or television shows, such as Spider-Man, Batman, or ironman. They can also lead games and activities for the children.

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The hero can interact with the birthday child and their guests, posing for photos and signing autographs. They can also perform a special birthday song or dance routine for the birthday child. 

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Overall, a hero acting for a kid's birthday party in Hong Kong can provide an entertaining and memorable experience for the children and make the birthday celebration extra special.