|“||I finally get to meet you, the person behind the glass. I'm glad...I wanted to thank you.||”|
Like Aiko Takada, Number 3 is a relatively minor character with disproportionate impact, connecting Kurama, Mariko, Hiromi, and Nana (indirectly), and leading, by way of inference, to the realization of the existence of Lucy.
Number 3 showed intelligence beyond her age, perhaps due to her growth in a hostile environment, and though she was outwardly only a child and appeared just as innocent, inside she was outraged at her cruel confinement and experimentation. While in captivity, she carefully bid her time and hid how strong her vectors truly were despite how much better she would have benefited from using them during the brutal experiments she endured, and all to make her breaking out of her cell that much easier for her and more surprising for her guards.
One day during feeding time, she surprised the guard and scientist who were handling her with her real potential, killing them both. She escaped from her cell and trekked through the hallways, killing other facility personnel, until she reached Kurama's office. After infecting Oomori and lamenting he "wasn't the one," she met Kurama face to face and told him she had wanted to meet "the man behind the glass" and thanked him. Since Kurama was the only facility researcher to show disgust toward the Diclonius' predicament, she decided to spare him from death and infected him with the Diclonius Virus via prodding his forehead with her vectors, like she did Oomori. Right after, she was shot and killed by Professor Kakuzawa with an armor-piercing bullet.
Months later, a horrified Kurama realized Number 3 infected him and Oomori with the virus when his Silpelit child, Mariko, was born. At first,it was believed Oomori was merely unlucky in his wife giving birth to a Diclonius girl, but with his own wife giving birth to one too, Kurama realized the births were connected. Before this, he wondered if there was a connecting factor between the rise in Diclonius births in a particular geographic concentration and time frame, and this new information drove him to conclude there was a "Queen" Diclonius infecting humans and leading to Silpelit births. Among the evidence leading to this conclusion was the fact that Number 3's mother gave birth to Diclonius twins four years after her birth, confirming the existence of an original infecting party. Ultimately, this would lead to the discovery and capture of Lucy.
As a Diclonius, Number 3 had vectors. They were estimated to be about one to three meters long.
- Several fan-sites give Number 3 the name, "Sanban," and state that she is the older sister of Nana. Neither the manga nor the anime contain any such stated or implied connection between them, nor do they give her a name (Sanban is Three in Japanese, just as Nana is Seven). This idea appears to be merely fanon or speculation. While it is also possible that this was an unstated plot idea by Lynn Okamoto, again its lack of in-series confirmation means that, for the purposes of this site, it will be noted but not treated as canon.