An Important Warning

Another reason to prevent our children from spending to much time (or any time, for that matter) on the internet is a simple and disturbing fact:

There are perverted images of cartoon characters everywhere. 

It doesn't matter if it is an animated disney production like Zootopia, a charming show for toddlers like Bluey or an epic cartoon like the Teen Titans, there are some creeps out there who make animated porn with this characters and carelessly upload them to platforms like Youtube or Pinterest where they can be seen by everyone.  

Some even take it further and make live-action fetish videos including characters like Spiderman or Elsa. The result is that children watch this videos eventually develop, outside of their will, obscure sexual abnormalities that haunt them.

All websites are at risk of this content, but the most mainstream ones would definitely be Deviantart and Youtube. 

Deviantart is a website full of furries (people who imagine themselves as anthropomorphic animals) and bronies (creepy My Little Pony fans). Albeit that's not the only content you can find it is good to stay away from it.

Youtube was plagued with fetish videos targeting children, they had to get rid of many of them but occasionally you can still find them. If you have a close encounter with this videos please denounce them, I don't expect Youtube to do a lot but if they do then that is good. 

Another necessary advice would be to stay away from Anime shows. It is true that some of this japanese animations are appropriate for children, but those are the minority since most anime consumers are adults. 

This means of course that they usually have uncomfortable sexually charged scenes. There are even some kinds of anime pornography, which one can reach too if he goes too far into the anime rabbit hole. 

Finally, stay clear from all the fandoms (website or page for fans) of any cartoon, video game or movie aimed at children. 

Firstly, because children should avoid socializing with people on the internet, for there are groomers and creeps all around us. 

Secondly, because this fandoms are proliferated by disturbed individuals who paint pornographic or suggestive pictures of their favorite characters. 

Thirdly, because some of this fans are extremely toxic and immature, insulting each other over opinions and ideas.