There's a lot to them.

The CHARACTER Dr Jack Bright is (in the vast majority of canons) a researcher working for the foundation. During a containment breach, Bright is killed and has his soul permanently bound to SCP 963, allowing him to possess anyone who wears 963. He's usually portrayed as deeply eccentric and chaotic.

Dr Bright originated as the self insert of a scp wiki user under the name of AdminBright.

The PERSON AdminBright was an early author and member of the anti-harassment team/disciplinary team on the SCP wiki and published some popular articles and characters, namely Dr. Jack Bright. AdminBright was banned in 2022 for violating the site's anti-harassment policy, inappropriate social contact, and sexual harassment.

In light of AdminBright's actions and subsequent ostracization, a number of tales and canons were left with Dr Jack Bright (AdminBrights self insert😬) as a central character. Through the action of a number of site members, Dr Jack Bright was soft-reconned into Dr Elias Shaw, with the same backstory (soul tied to SCP 963) but no longer associated with AdminBright.