He was first a normal sans but with error becoming less violent and also destroying less FATE upon seeing  it's creation no longer obeying them it created another as a play run. Fate wanted to make the balance correct but ink the protector let a lot happen and it was destroying all the multiverse

Then randomly one of the classic timelines was effected and it made that sans corrupt just like error only this one got more disturbed on the way... His soul slowly dissolved into a million colorful fun speks and it was painfully dispersing over his body and around where it should be. He after a while needed an escape as he called it. He gave himself the name 'Noise'.

The first young inspired lad became rotten inside he lost his hope and his soul he was full of hate and energy and he felt like the villain of it all. He wanted a punishment for all he had done like kill and destroy places...

He had gotten ears with broken code from the amalgamation of the dogs which mixed in and changed when his physical torture toward himself became sexual torture realising people would hurt him willingly if he'd just tell them it was his 'kink" even if he had no idea but bondage and whips were his new thing... His guilt and pain was building up inside and it is bursting and God help us when it does...

Because it's a beautiful day outside...

Birds are singing flowers are bloomin' but

When our little masochist blows up...

We might as well all burn in hell

Even then our protector and destroyer won't save us.