•Jevil was tortured by the kings for information that the 'Knight' gave him that made him go mad. But it was the kings that fully broke him- he associates anger with pain-- and when he gets scared or nervous he starts repeating more words until almost every word is repeated

•Headcanon Jevil hight: 3 ft 3 in

•Jevil can purr like a cat

•Both Sans and Jevil have nightmares

•If you pull Jevil's tail his head does the jack in a box thing- with the spring

•Jevil finds an odd comfort with blue magic, it's easier to calm him down if you turn his soul blue

•Jevil's soul is a lot different to other souls. It's still upside down like a normal monster soul, but instead of being the norm pure white, it's a deep, dark purple color

•Jevil is always full of energy. 8am? Energy. 12pm? Energy. 5am? Energy.

•He doesn't sleep often, usually using his magic to entertain himself the while others sleep.

•Jevil can really do anything. Ride a unicycle? Yep. Juggle? Yep. Teleport? Yep. Make toys? Yep. Spawn 50 frogs in someone's house because they made fun of his friend? Yep.

•Jevil can break the rules of the game. That's how he can teleport and turn into the Devilsknife. But he can break it in far more ways than you can imagine

•Jevil leans on his tail a lot. It's like a cane but attached to him. He can also use it to hoist himself in the air, and it's strong enough to be able to be used as a chair for the jester

•He loves to entertain. Tell him your bored and he'll put on a show just for you. He loves to make people smile

•*slams hands down on table* TRANS JEVIL TRANS JEVIL TRANS JEVIL TRANS JEVIL

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More to add on later