If you mean "unique personality" as in separate from your social media account, that was also announced in the video. Apparently users will be able to create Meta accounts that are not linked to a Facebook profile. They'll start with introducing work accounts and it will be generalized from there.
I'm not a furry, but I definitely appreciate the ability to be anonymous online.
Regardless of how pseudonymous facebook allows a person to be on various 'verses, they're still linked back to a facebook-mandated real name account. If a person's persona edges too close towards stockholder's disapproval, your name suddenly disappears from a large chunk of the online world. Anonymous accounts must exist forever.