Deuterium the Sentient Mattress

Deuterium the Sentient Mattress is a YouTuber who started streaming in 2020 and debuted his first VTuber model in March 2021. He is best known for his "All the Inaccuracies" series of videos in which he points out factual inaccuracies in children's cartoons.

Deuterium streams twice a week, on Wednesdays and Saturdays. His Saturday streams, aptly titled Saturday Chaturday, typically consists of 1.5 hours of gaming or variety content followed by 1 hour of interactive games such as Jackbox Games. The Wednesday streams are 1-hour work streams where he works on YouTube videos for his channel. Deuterium is also autistic, having been diagnosed with Asperger's Syndrome at a young age.

Deuterium is a young toon who ended up in his present state on account of being a smartass to the wrong toon. At the age of 18, he pissed off a certain cartoon character by pointing out the inaccuracies in their show. So much so that the cartoon character in question turned Deuterium into a toon as well, which also wiped all memory of his real name. Now he's permanently stuck at age 18, in a cartoonish form that resembles what he looked like at that age. The perks of being a cartoon include nigh indestructibility and high tolerance for pain, but the lack of ability to age also sometimes makes him a bit peurile. He still points out the inaccuracies in cartoons and such, reasoning that now he's a toon, not much worse could happen to him.