Image by the author using Midjourney.
Michael Roland (who insists on being called "Mike Ro" for short) was a worker in the sewers fifteen years ago when he was attacked by a creature made out of magical slime. He was rescued by a group of Vigilants led by Trisa Crow (Amos's mother). He retired afterwards, claiming his leg injury made it too hard to work under the streets of the city. Although his knowledge of the city's sewer systems is somewhat outdated, it is definitely extensive.