Cool. I hope you like them. Out of those, PBGGameplay, ProJared Plays, and TheRunwayGuys are the best.
ProJared just finished Super Mario World Co-op where he was playing with his editor but his editor was
controlling the enemies and trying to kill his character for most of the series except for the last two or three videos where they actually worked together.
PBGGameplay which mostly consists of PBG and Jeff have been playing Super Mario Sunshine hacked where everything is out to get them It's pretty funny.
TheRunawayGuys have been playing Pikmin. Jon's never played it much before so chuggaaconroy has been helping him a little. I'd highly recommend TRG's Wheel of Fortune's videos
(the oldest ones are the best) and Super Mario 3D World. Those are the first two playthroughs I watched when I first subscribed to TRG.
The three British Poketubers I watch are Patterrz, GameboyLuke, and FeintAttacks. They pretty much only play Pokemon Nuzlockes
but I also really like GameboyLuke's Mario Maker and Undertale videos. So far he's the only YouTuber I watched who almost played it completely blind.
He never finished Undertale and has been taking a break from Mario Maker but the videos that are there are really good.