Ghost^^

Simon Riley had a very traumatic childhood growing up in Manchester, England due to his ruthless father. Most days, his father would bring dangerous animals and tease them, even going so far as to force him to kiss a snake or threaten to kill him. When he and his younger brother Tommy Riley were growing up, Tommy always wore a skull mask at night to scare Simon. Simon's father sometimes took him to Bone Lickers concerts. At a concert, his father made him laugh about the death of a drug-addicted prostitute.

By default, he wears a balaclava with an illustrated skull and sunglasses.
In his death, Ghost is shot in the shoulder and is not incinerated unlike Roach. Although when his corpse is seen before being incinerated by Shepherd's men, it is seen that he was shot in the stomach. This could be a bug in the game.
Ghost means "ghost" in Spanish. His alias probably comes from his stealth skills and his effectiveness in operations.
In Call of Duty: Modern Warfare 3, when playing in confirmed kill mode and then going to theater mode, you can see that the caps read: Simon "Ghost" Riley [01-23 2011] Unknown - Other
There is a comic about Simon's story.
Possibly due to his popularity, Call of Duty: Ghosts took his alias as the title of the video game released in 2013. In addition, the pet of one of the playable characters, Logan Walker, is called "Riley", apparently making a reference to the character.
His default weapon appears to be an ACR, as in most of his appearances, he is found using such a weapon.

In the game, Ghost has received a development upgrade, his personality is still cold and reserved, but as he spends time with Soap, the lieutenant becomes more relaxed. Protective, loyal, brave and persevering in the face of a mission. Although he is quite distrustful of others. A couple of traumas but stable.

It is only known that he is Caucasian, has some tattoos on his forearms, brown eyes and a somewhat hoarse voice. 57 kg and 1.79 meters.

She wears almost her entire body covered, exposing only her forearms at most in one of her outfits.
He always covers his head with a mask to which he added the front part of a skull and painted the lower jaw of this on the fabric of the mask.
He wears military attire, but added a cape to one of these and a hood to the main one.