There is a fair amount of sexual innuendo with this movie, so it may not be appropriate for steronz’s 5yo.
My three-year-old loves Totoro - she will occasionally pick up a leaf, hold it over her head like an umbrella and proclaim herself a “little Totoro”.
I’d be curious to try 5,000 Fingers of Dr. T on a young child. It’s weird enough but they might actually find it a bit dull.