He’s not exclusively N64, he covers a wide array of topics, but you could probably find a few decent videos from The Gaming Historian.
Same thing with Nintendrew, and MetalGamerJesus.
Edit: Sorry, I had the wrong name. His name is actually MetalJesusRocks. Brain fart!
In the same vein as MetalGamer Jesus, Game Sack has some N64 episodes as well.
ThaBeast722 if you’re looking for plot and gameplay summaries. ThaBeast is on a challenge to complete every N64 game.
There’s Nerrel who is both very entertaining and knowledgeable/informative about the N64 and emulation. He does use strong language so just wanted to point that out in case that isn’t your cup of tea.
He’s criminally underrated but does deep dives on tons of n64 games. Really enjoy his content.