Saul Goodman

Saul, originally of Irish descent, has had multiple wives in the past, one of whom he caught having sex with his stepfather. At a certain point, he developed a romantic relationship with his secretary, albeit short-lived. As a lawyer, Saul changed his real surname from McGill to Goodman, as he claims his clients feel more comfortable with (that they presume him to be) a Jewish lawyer instead of "white".
He has a highly stylized office in a cheap strip mall. With a repertoire that includes small-time drug busts, fraudulent insurance claims, class actions, and his overbearing manner, he might seem disreputable to police and certain other lawyers. Despite his shady appearance, Saul is indeed a highly competent extra-legal operator, adept at sniffing out legal loopholes and able to negotiate good deals on the behalf of his clients. He has a strong familiarity with the criminal trade and has connections to some of its most influential distributors, like Gus Fring. He also employs the services of a veteran private investigator named Mike, who respects Saul for who he is, and executes often illegal commands from Saul and Gus such as cleaning up crime scenes and bugging homes. Goodman is also not without integrity as he is shown to honor the ethics of his profession, particularly the attorney-client privilege, and is reluctant to involve himself with violence or murder.
Saul was introduced in the episode "Better Call Saul," following Badger's arrest for selling meth. After his arrest, Walt and Jesse contact Saul, as he is known as a criminal lawyer instead of a "criminal lawyer". Walter hires him to keep Badger out of prison. He soon becomes a regular character on Breaking Bad.