The official story of Chad: Before Mr. Stanton left SHHS to become the principal of an elementary school, I led a secret recon mission to recover Chad from his office, to liberate him and keep him at SHHS. Chad was part of an All Night Party years back, and he couldn't leave Stallion Country. Chad was named in 2014, and has been an unofficial class mascot ever sense.
The unofficial story, well, that's classified! ;)