Lisa Lisa

Lisa Lisa (リサリサ) is a character primarily featured in Part II: Battle Tendency, who also appears briefly at the end of Part I: Phantom Blood. She is Caesar Antonio Zeppeli's mentor and Joseph Joestar's mother.

History
Elisabeth Joestar was the baby Jonathan Joestar saved at the end of series 1 and gave to his widow Erina to raise. She was subsequently adopted by the hamon user Straights, and learned the art of hamon from him until her 18th birthday. As a young adult, Elisabeth eventually married George Joestar II, and they had one child. George, unfortunately, had no hamon powers, and was killed by a zombie who had served Dio Brando. Elisabeth murdered her husband's killer and burned him to ash, but he happened to be a high-ranking military official. In order to avoid retaliation, the Speedwagon Foundation helped her to erase all evidence of her existence.

Battle Tendency (1938-39)
Under the name Lisa Lisa, she first appears as a mysterious Hamon user whom Joseph meets in Venice.

She soon reveals herself to be Caesar's mentor and trains Joseph in the ways of hamon (starting off by giving him a mask to modify his breathing and hitting him in the head with an oar) before joining in the fight against The Pillar Men as a powerful hamon user in her own right.

She's shown to have the Red Stone of Asia and mentions that destrying it would be make fighting The Pillar Men just that much more difficult hence why she keeps it on her person.

It is eventually revealed that she is Joseph's long-lost mother, despite her youthful appearance.

She is gravely wounded in her one-on-one struggle with Cars, but manages to survive. She later tells Joseph her relation to him personally, at his own funeral.

Post-Battle Tendency
She eventually remarries to a Hollywood screen writer, and may have died between the end of series 2 and the beginning of series 3. It should be noted, however, that Joseph talked to her about the Joestar birthmark right after discovering Dio's resurrection, putting her in her mid-to-late 90's by a presumed time of her death.

Trivia

 * The character Rose from the Street Fighter series is based on Lisa Lisa. Rose's outfit is almost identical to Lisa Lisa's, and she also channels her "Soul Power" into her scarf to fight. One of Rose's alternate costumes in Street Fighter 4 is Lisa Lisa's outfit.
 * Notably, Lisa Lisa also bears some resemblance to her master Straights.
 * Her forms of training are the breathing masks, the hell climb pillar and a final confrontation with her two best fighters (in this case, Loggins and Messina)
 * It's mentioned that Street Fighter's Rose' appearance is based off her