Sango Arakawa (荒川 さんご Arakawa Sango) is the estranged mother of Kenshin Hattori.
When Sango met Kenji Hattori, the two fell in love with each other, but she disappeared some time in their relationship. In truth, Sango worked for another clan that was an enemy of the Hattori Clan and tasked with killing Kenji Hattori, aka The Black Raven. However, she found herself falling in love with Kenji and left after she found out she was pregnant with his child.
Knowing that she and her son would be targeted for her betrayal, she disappeared and remained off the grid. She knew that she would be unable to properly protect her son while on the run from her former masters, so she left Kenshin with Kenji. Her current whereabouts are unknown.
- Sango translates to 'coral.'