Blue is a main member of the Spaghetti Cave.
He is a 16 year old male, with brown hair and white skin, as well as a blue hoodie, dark blue pants and grey shoes.
Sometimes he is spotted wearing blue sneakers, or a turqoise backpack.
In 2023, a teenager named Henry Martin (who is now blue) was spotted walking into a nearby forest, and from there wasn't seen again until 35 minutes later. A nearby 911 call reported a trapped kid inside of some debris from a collapsed building, and so Martin's body was found, crushed from the weight of the building's rooftop. While others don't know what happened, Blue himself confirms what he saw through an interview. Here is what he described:
"I was walking home from school one day, when I noticed a strange building in the forest nearby. I decided to check it out, and it turned out to be an abandoned cartoon work station. It had elements of storyboards from different shows, like Looney Toons and such. I looked around for around 20 minutes or so, but then I noticed this weird room. There was nothing inside of it, except for a petalstool with a regular pencil on top of it. It felt like I NEEDED to pick it up, but when I did nothing happened. I got bored and started to leave, but then the building started to collapse on itself. I was like 3 feet away from the exit, but I tripped on falling rubble and my legs were trapped from the debris shortly after. Next thing I knew, I was crushed. After that, I found myself in this white void, with my body being completely absent. I looked around, and saw the outside world through this translucent screen. I was dead. After a bit of panicing, the same pencil I found was there as well, and so I experimented with it and that's how you see me today."
After the public found out about Blue, he quickly became famous for being a living and breathing cartoon. Some time later he faded from obscurity, creating Red during his disapperance. He would then join the Spaghetti Cave, and soon after Endgame he became one of the main members.