Sandbox fan fiction. Fill in the blanks

i have seen multiple times something like this, everybody can sign in their character. I going to do this and i would like if some people would help me with writing the story. If you're intresseted send me a message.

if you want tto sign up a character fill this in. These are exemples, i don't use it

Protagonist/Antagonist: Protagonist

Name: John McTavish

Codename: Alpha 0-4, Soap

Affilation: SAS

Age: 32, born 17 march 1980

Rank: Staff Sergeant

Speciality: Sniper marksman and bomb specialist

Death: 6 december 2012, new york, USA

Weapon choice: M4A! w/ Grenade Launcher and Red Dot Sight, USP. 45 tactical light