The Call of Duty: Black Ops 4 Black Ops Pass includes 4 Exclusive Blackout Characters for players — as announced by Activision alongside the pass earlier this year, and the first of the four characters is available to use on Day 1 if you have the Black Ops Pass.
The character is called “Shadow Man” and is only unlock able with using the Black Ops Pass — there’s no other way to get the character in Blackout. A neat feature in Blackout is that it shows underneath each of the character’s name which Black Ops game they debuted in.
It appears that the rest of the 3 characters coming with the Black Ops Pass will be made available at a later date. It’s not clear yet what those 3 characters are or when they’ll be available, so stay tuned.