I watched Good Mythical morning on Kids YouTube all the time when I was younger, like nine or so. If it isn't already on there, it gets a vote for me! They were my favorite, and I even streamed their (*cough*) bad (*cough*) music in the car on my playlist, it came as a "whats this weird thing my child is playing" to my mom but she laughed and liked it.
Secondly, Evantube - I haven't checked on him since 2016, and I don't know where he's grown, considering I think were the same age. But, I used to like his videos since I also streamed it off Kids YT, it was very enjoyable to younger viewers. I might check where he's gone over the past years.
I heard Laurenzside is a good YouTuber, I don't watch her videos considering her personality isn't really my cup of tea, nor her direct content she has is my cup of tea. But, I've heard people really like her, and she has a "semi" large follower count. I always heard she does not swear or post adult content, neither did I see any adult content scrolling through her page.
DOLLASTIC - Oh gosh. I loved her so much, I even follow her (I think I do, not so sure since I only follow some doll makers), but I watched her ALL the time when I was younger. Same as I did CookieSwirlC, but I loved her unboxing and she is a kid friendly channel since she directs her content to a younger audience (I believe, either way.) She makes amazing customs, too.
Theodd1sout - I used to watch him a lot, he's a very charming and kid kid friendly Youtuber and animates really cool videos. I liked watching him a lot, he is very entertaining and kid friendly since he does not cuss, or from what I've seen. And never posts adult content. So he is one to consider about.
Hope this helps, KS!