I freaking love Let's Game It Out, I watched most of their videos. My favorite one was their first Sims 4 one, the one where they made Keanu Reeves imprison Rusty and paint pictures of him in his daily life (in fact, it was that video and GrayStillPlays that got me into Sims 4). The Planet Zoo series is amazing too.
Super Mario Boards
Xiahou Ba
Blitzo
Me too! 
I love the one with the killer bears when he goes to the moon
The Sims one is hilarious too (I've actually never played the game and had no idea npcs could age (though he could have faked the aging bit) )
I love the one with the killer bears when he goes to the moon
The Sims one is hilarious too (I've actually never played the game and had no idea npcs could age (though he could have faked the aging bit) )