Brad & Roger were two remarkably large snakes that were paid to protect Amanda Sefton's base of operations in Limbo from wrongdoers. They questioned Nightcrawler when he paid his former lover a visit, and warned him against remaining in Limbo for too long. Brad & Roger were both capable of speech, and displayed both playful and antagonistic qualities. They were even capable of wry humor. 
 
When Nightmare attacked Amanda Sefton's fortress, he used his powers to

knock Brad & Roger unconscious. Margali Szardos discovered the snakes, and rushed to her daughter's aid. The current status of Brad & Roger is unknown following the resurrection of Illyana Rasputin by the demon sorcerer, Belasco, but the likelihood that they are still residing in Limbo is probable.