"Zero, a versatile and deadly hacker available in both Multiplayer and Blackout. In Multiplayer, Zero can disrupt and distract her enemies using the powerful hacking tools at her disposal, bringing new counteractive measures to the table in Black Ops 4."
— Official Description
Leni "Zero" Vogel is a playable Specialist in Call of Duty: Black Ops 4, added with Operation Absolute Zero on December 11th, 2018. She can be unlocked for use in Multiplayer and Blackout by reaching Tier 1 in the Black Market contraband during the aforementioned operation. Post-Operation Absolute Zero, she is automatically unlocked for any player.
Not much is known about Leni Vogel's early life. What is known however is that she is a self-taught digital security expert with a penchant for countermeasures and an arsenal of technology-crippling hacks.