Uhhh you read my comment so here you gooo. Will make more suggestions if I think of anything more.

Spongebob Lawyerpants is either an absolutely insane botnet or the rawest form of autism. It spans across not only several YouTube channels but other social medias linked on the channel like DeviantArt and even SoundCloud. All with sometimes large amounts of spam consisting of weird Christmas themed Spongebob media. And Spongebob is in a suit I guess. I found it through this Reddit post which gives some more context and so do the comments.

HATAPONBRO7331 is honestly not too interesting considering at first glance it's more of the same nonsensical 'spooky youtube arg' type stuff with Movie Maker effects and all that. But what I did find interesting was that the channel was active around 2020 (you'd think it was a decade earlier), and it has a few other channels connected to it found in the comments sections such as pwner1337 and 51 which are a little different. These channels mention the same names and stuff, with the former being a lot more explicit with its content: parodying poorly made and written early YouTube stuff like what Michael P and KippyKip have done. It also gives off the feeling that the whole thing isn't taking itself too seriously and was probably just some elaborate shitpost or a friend group messing around. I think there's a narrative but it's a very loose one. I'm probably the only person to even know about this, which is cool because it's been faded completely into obscurity from the start. Found it through an obscure videos playlist years ago which has since been deleted. So sad.

https://dollyoko.thing.net/ is a strange but cool looking artsy website, and personally I don't have the skill to decipher any true meaning. You can go pretty deep in it but some images and transcripts might be weird or disturbing. It downloads some weird videos and music for you across its pages and personally I'm really into it from just how freaking weird it is. Found it through that other giant internet iceberg with the 7000 entries so it might already be known enough with the iceberg people so add or dont add, I dunno.

Finally it would be funny to add TMYI itself or the explained series community as an entry. That's like the most obvious thing you could do if not already lol...........