>>76489365Kiara - Talked about 4chan on stream multiple times
Mori - Won't call it by name but has referenced things here many times
Reine - Laughed a lot and psudo-shitposted during the Streamer Overload game on their version of /vt/. Also made members posts kind of calling out on schizo in /mep/.
FuwaMoco - Oldfags who tongue in cheek have mentioned it before. Read a post in their thread asking why they weren't streaming from the office during the move and made a direct reply in a members post on youtube.
Risu -Meme'd and posted stuff here before twitter
Ollie - Same as above
Mumei - Is orcschizo.
Gura - Made jokes about containment breaking in stream and a few other tongue in cheek references.
Basically all oldfags who have been around /a/, /jp/, and /cgl/ for YEARS before vtubing was even a thing. You don't just forget about this place and a lot of those were just starting when the board was made, so I'm sure they occasionally check in. I wouldn't be surprised if there's even more. Now I won't argue how often they check or if they sometimes post, but most of them sometimes look at this place.