Check out the website Common Sense Media. They do a great job of listing which movies are good for which age groups. You can also find lists of movies based on which streaming service you have access to.
I've really enjoyed The Mitchells Vs The Machines with my little guy lately.
Pretty much any movie by Studio Ghibli.
Maybe not Grave of the Fireflies.
Definitely not Princess Mononoke either. Everything else on there is certified adorable and kid friendly.
As a child who wore down his Princess Mononoke DVD to the point that particular moments would skip or freeze each viewing, the only lasting impacts I've suffered is an inclination towards environmental terrorism and deep seeded short hair fetish.
Otherwise, I turned out fine.
inclination towards environmental terrorism
Been rewatching Pokémon with the child and it seems that direct violence is the solution to most problems caused by industrialism and/or capitalism.
Mononoke is my favorite... But it's not for kids
Younger kids:
Older kids:
Tis the season, polar express?
How to train your dragon? (Watched at 6 or 7)
Pokemon movies?
My kids always liked the Wallace & Gromit shorts--all the Aardman stuff.
Bröderna Lejonhjärta , all ages but implied murders by dragon and soldiers
Spongebob movies
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Be respectful of others' parenting decisions.