Legend-specific Passive Perks have a bit of a sordid past in Apex Legends in that most of them have been removed at this point. The only Legend Passive Perk still in the game is Fortified. Fortified is a perk that is specific to bigger Legends like Gibraltar, get a built-in passive damage reduction to make up for the size of their hitbox. The full effect is that incoming damage is reduced by 15%, and being hit by bullets will not slow them down.
The Fortified perk’s damage reduction formerly also applied to headshot damage reduction, but with the debut of Season 13: Saviors, that is no longer the case. This makes grabbing a good helmet when playing as a Legend with a large hitbox extremely important, especially with the helmet buffs for the new season.
The Apex Legends development team has said in the past that they would like to eventually reach a point where all Passive Perks will be removed, so this change could very well just be the next step in that line of thinking.
For more Apex Legends content, check out All weapon buffs, nerfs, and changes for Apex Legends Season 13: Saviors on Pro Game Guides.