Lightray

He had some seriously fantastical delusional ideas about shadow creatures who, in his words, in short, wanted to fill Equestria with filth, and he had to cleanse the corrupted souls. He's crazy.
Lightray is a pony with a dirty soul inside, he has a dark red mane that serves him as hair and a tail in the same color, because of his anger he has two personalities and he is schizophrenic - he has strange voices in his thoughts that manipulate him and talk about dark souls, but he believes.
The entire Equestria of Ponyville could be in danger because of this psycho. Lightray has a sister, a pacifist Pegasus. When she plays her violin, her melody can lull others to sleep and heal their physical wounds, provided they are not serious. Her hair and tail are also dark red, and her skin is also yellow.
He is hated by Doctor Psycho, a unicorn with brown skin and a black hat, a detective. Doctor Psycho hates him because Lightray burned his entire family except his sister, and he doesn't even communicate with her.
Fun fact: The second personality says that he loves oranges, but the normal state of Lightray hates them.