|Name in Japanese||エル・ワトソン|
|Romaji Translation||Eru Watson|
|Debut (Light Novel)||Volume 8 - Tornado High|
|Appears in||Light Novel, Manga, Video Game|
|Voice Actor (Japanese)||Maori Oonishi (Pachinko)|
|Title (s)|| "Ven" 西欧忍者（ヴェーン|
|Ancestor||John H. Watson|
SIG SAUER P226
"That was dangerous. You are...Aria, are you not? I knew when i first saw you."
L.L. Watson (エル・ワトソン Eru Watoson?) appeared during the events of Volume 8 by trying to drive a wedge between Aria and Kinji. After Kinji defeated by her, it was revealed that Watson is a crossdressing student with her real first name being Elle. She became a contracted member of Team Baskerville.
Watson is a teenage girl with shoulder length brown hair who typically crossdress as a boy. She wear straps around her breasts to hid them and gives the appearance that she is a boy. Watson typical wears the Butei male uniform, but during her "Shock Therapy" session she will change into the Butei girls uniform.
Watson at first was prejudiced against Kinji merely because Aria holds him in higher regards than she had ever seen Aria do so to anyone. She showed off her cleverness and powerful influence to isolate Kinji in her method to defeating him, which she later felt very bad about following her defeat by him.
However, Watson has the capability of acting feminine. This is shown very vividly in the events of Volume 9, where Watson deliberately asked Kinji to perform intimate acts with her as a method to overcome the trauma of being raised as a male.
Watson is also very kind in both a clinical and general manner. She has shown this when she had stated her wish to abandon discrimination between patients.
Elle Watson is the fourth generation descendant of John Watson, companion of Sherlock Holmes. Due to her ancestor's achievements along side the legendary detective, her house was granted the title of nobility and her house has been one of England's proud noble families since then.
When she was born, Elle was met with disappointment from her father since she was born a girl. Thus her father forced her to dress and act like a boy to make up for it. She took up a boyish front, looks, and mannerism despite knowing very well she is a girl. Despite this, at some point she and Aria were to be married despite never meeting each other.
- She completed her Assault and Inquesta courses before transferring to Tokyo Butei High School.
- As royalty, her family holds the title of "Viscount."