Wato primarily goes by her last name, and is a very confident and outspoken teenage girl. Despite her size, she is quite strong and capable of winning a physical fight. In her original manga The Three-Eyed One, she hangs out with her classmate Sharaku Hosuke, whose forehead bandage conceals a third eye. She is one of the few people who know that exposing his third eye turns him into a demonic warlord, and helps guard this power with him. Quite often she was involved in fan service in the original manga.
In the Black Jack TV series, Wato and Sharaku appear together as brother and sister. Her name is adapted from "Watson", and Sharaku's full name is adapted from "Sherlock Holmes."
2003 seriesWato appears in the episode "Old Dog, New Tricks" in the 2003 series as Dr. Wato, a scientist specializing in magnetic force. Sharaku appears as her son, and she gives him a super magnetic orb that can control a robot capable of disassembling into tiny pieces. She gets kidnapped by Skunk Kusai and is forced to use her robot for robberies, under the threat of Skunk jeopardizing her son's safety.
In the English dub, her name is Dr. Creinberg and her voice actor is Candi Milo.