Lemmino hits 1 and 3, and sometimes 2 (some of his videos are about dark topics, some are more fun or wonderous). His voice is very nice to listen to. Smooth, low, and a relatively thick, but perfectly understandable Danish accent.
To boot, he’s one of the best goddamned researchers I’ve ever seen. For example, he did a documentary on Jack the Ripper. Instead of just going over the same beats everyone else does, this madlad poured over dozens of police reports, newspaper clippings, and eyewitness accounts from the time of the events, (more than 150 years old), and then compared those to more contemporary research to make a more complete study. He somehow put all of this together into the most cohesive description of the events I’ve ever seen, all with detailed and accurate CGI visuals (nothing graphic, just to show locations and timelines and such).
Really, really dedicated guy with a huge amount of integrity in his work, lots of creative flair, and no annoying biases or wild assumptions.