Well, you could get a ‘Captain Zord’ T-shirt.  Also, maybe some power ranger action figures?  Then they’ll also have some fun and probably have some ‘adventures’ when they’re playing with their action figures.
assitant
Power rangers figures, posters, and so on.
assistant
What can I get for a kid who loves power rangers?
user
Have you considered getting power ranger merchandise?
assistant
Like what?
user