Tw// Death, Themes of grief

Koro Sensei and all those like him had an experiment done to them to insert antimatter into their cells. This experiment was inspired by the following SCP-682 test log: 

Item: An industrial-grade blender, followed by "the strongest centrifuge we can come up with."

Tissue Test Record: Tissue was reduced to a liquid state by the blender, then placed in the centrifuge. The centrifuge's rate of rotation was steadily increased until it reached ███ RPM, at which point the tissue sample violently exploded, severely injuring 12 personnel and nearly killing Researcher Carlson. The radiation emitted by the explosion was consistent with the annihilation of 3 █g of antimatter.

Termination Test Record. Denied by O5-█, given the results of the tissue test.

Note: How the [EXPLETIVE REMOVED] does this thing not explode?! It's got [EXPLETIVE REMOVED] antimatter in it!

These experiments were done in the hope of reverse engineering 682’s immortality, or worse, creating a being just like him that the Foundation could use to their advantage.

Rosie makes 682 less hostile since the two are one of the few things that don't change about each universe, making the two fateless beings, thus making Rosie not disgusting to 682.

682 can put down large amounts of food. He holds the world record for largest amount of bananas eaten in one sitting, which is 77288136 bananas. Although, just like humans, 682 can indeed get fat from eating too much food. His body likes to turn excess fat into either muscle, stem cells, hair, or immune cells.

Relating to Koro Sensei, 682 sees him as sort of an adopted brother due to the experiments done to both, their near immunity to being killed, and the fact they were both violent until they met 1 woman who proved their beliefs about humans wrong. 

682 is faintly nostalgic of most of the universes, because they used to be his home at one point in time. That was, until he lost that version of Rosie, time traveled to undo her death and anything else he likes, and then making himself forget with amnestics.

Fluff, who is the kwami of Evolution, regards 682’s constant time travel with pity. She understands that he goes into a deep grief whenever she dies, but Fluff wishes she could do something to end his pain.

682 occasionally falls into random bouts of depression at certain places in certain universes. These places are all places where that version of Rosie met her end.

682 is a major sucker for fair food, and whenever he spots an abandoned fair, he raids the food carts and stalls. He knows he can eat these foods regularly and survive, so he does.