Not really a Let's Player, but Demolition D+'s streams are some of the chillest and funniest stuff to watch, and mostly fit the criteria you described. He can get a bit "shouty" (and drunk) but it's less in the forced PewDiePie manchild way, and more in the drunk, nihilistic, self loathing, "Rick Sanchezy" kind of way. Other than that, he has a pretty chill personality and voice. He's into Souls games, horror games and all kinds of other ironic weeb shit. He plays mostly on the PC, and while he hates his PS4, he does occasionally turn it on to play Bloodborne on it. He has a rich and diverse taste in games (lots of niche stuff like Nier, Drakengard, Team Ico games etc.). I think he's probably my favourite Souls game streamer, because he's not super anal retentive and dull like other more hardcore souls games channels, but also not completely fucking worthless and horrible like DSP. He just has a cool, devil may care attitude and just does the things he does because he enjoys doing them, and not because he wants to pander to his fanbase.