I mostly find kiwifags amusing. They're essentially children who want to be hardcore but mom won't let them, and the larger chunk of the userbase is just people who haven't mentally moved on from old mindsets that no longer work or have any validity in the modern world. I think of them as the last exhausted remnants of a bygone world of soccer mom morality. Thoroughly obsolete. On the flipside I find their "general" threads and random discussions untied to lolcows and such to be interesting and useful, like a less offputting reddit.
As for TVA I already said that I consider a vtuber forum a necessity due to the rapidly changing nature of open Internet and the possibility 4chan becomes unusable. I actually think forums may make a comeback in general. I'm well aware I have my own hate group of sorts here, but this is by no means a new situation for me nor do I particularly care since it's effectively endearing in a tsundere fashion. I just see a bunch of Asuka's so to speak. It's cute.