Toastedcherries is a youtuber who primarily makes videos about the history of ROBLOX, a game with a suprising amount of history. They also make music under the name "toastywav."
Summoning Salt is a youtuber who covers the history of speedrun of games, and was one of the main creators who spearheaded the "history of ____ speedruns" video essay.
I'm not that good with horror, but Alex Kister's work is so good that I would rather suffer a panic attack that miss out on a mew upload from him. His "Mandella Catalouge" analouge horror series is a constantly evolving series, with each new volume including better visuals, more suspensful moments and, better scares. Alongside that, he recently started a new series called "Mystifying Oracle", which is a series with the visuals akin to older YouTube. (around 2007-2010)