The Birth: Her real name is Mary Walker and she made her first appearance in DareDevil #254. She was abused as a kid and later in life she adopted this Typhoid Mary personna. Oh, and when she gets really steamed up, she is known as Bloody Mary.

The Legend: Typhoid Mary has teamed up with many heroes though not staying in one place for long. She's been with Daredevil, Wolverine, Ghost Rider and even with the Power Pack kids. Of course, these relationships tend to be quite adversarial.
She also dies for another whack at asassin; Deadpool. And the Kingpin is another guy who she crosses paths with. When in her "Blody Mary" mode, she doesn't care about which guy is in front of her, she just wants to destroy all men.
Her powers include a low level psionic ability Typhoid uses with surgical precision. She has made such strong-minded individuals as DareDevil and the Kingpin think they were attracted to her. She is also capable of telekinetics and pyrokinetics.