|Index: "What is this? Agathions?"|
|Name (Kanji)||雲川 芹亜|
|Name (Romaji)||Kumokawa Seria|
|Affiliation||Academy City Board of Directors|
|Family||Kumokawa Maria (Sister)|
Kumokawa Seria (雲川 芹亜 Kumokawa Seria?) is a side character in the Toaru Majutsu no Index series. She is a third-year student attending A Certain High School and is described as a genius. She's currently employed by Kaizumi Tsugutoshi, one of the twelve members of Academy City's Board of Directors, as his advisor .
She is called a “beauty senpai” by her kōhai students as a tribute to her attractive looks, which feature shoulder-length black hair, fringe tied back, and a fine body with an exceedingly ample bosom.
She commonly wears a school-issued sailor uniform with its standard skirt changed for a “defensive” long one. Her navel is readily observable in the gap between her blouse and skirt. She is smart and athletic, and looks so accordingly.
She supposedly needn’t worry about money, only needing red tea to go along with cake. Although an adolescent, she could taste the difference between brandys; she even wouldn’t look out of place should she drive around in a sports car. Of course, the latter descriptions were just an impression others would get when they look at all.
She is considered to be a very manipulative and calculating person who thinks of the big picture many times. Often than not, people whom she works with feel she is a force to be reckoned with. At other times she can be seen as aloof or arrogant in her manners (something which got Fukiyose Seiri very angry). She seems to enjoy teasing people at times, once saying that Seiri copied her looks.
She's very knowledgeable in things happening on the Science side, knowing about Deep Blood, Imagine Breaker, and the Level 6 Shift project. Personally she's very interested in Touma and his ability Imagine Breaker.
It is unknown when and how Seria became a "brain" for a director but in a conversation with Director Tsugutoshi, she apparently chose to be an upperclassmen with a school life meaning she had a different form of occupation. 
Chronology (Toaru Majutsu no Index)Edit
Toaru Majutsu no Index Light Novel Volume SS2Edit
- Main article:Toaru Majutsu no Index Light Novel Volume SS2
She debuts in the sidestory. She is the one that proposed using the SISTER clones that's going through "adjustment" in various parts of the world to collect the 50 or so 'gemstones' and keep them under their protection, so as to resolve the issue of governments and/or various other agencies from forcibly taking control of natural born espers, or 'gemstones', to try and build another esper research facility (even though according to her the chance of them discovering a way before they end up killing the gemstones like lab rats is zero) opposed to Academy City, It is implied she made some sort of deal with Heaven Canceler in order for the SISTER clones to be mobilized. .
It is also implied Seria knew Kamijou Touma from before his memory loss .
Battle Royale ArcEdit
- Main article:Battle Royale Arc
She's also mentioned in passing in Volume 19, when GROUP needed an ally on the Board of Directors to fight against the Director after them they ruled out Kaizumi as a option, since Seria would not be fooled easily and might advise Kaizumi against helping them.
Chronology (Shinyaku Toaru Majutsu no Index)Edit
- Main article:Homecoming Arc
She meets Touma again when he returns to the city but heavily intoxicated, she is one of the group of girls that follow him back to his dorm only to later leave. It is revealed that during his absence from the city she became lethargic and commented on being regretful neither she nor the director Tsugutoshi could help out Touma despite the fact they had power.  After an attempt to re-energize herself, she commented she couldn't keep such appearance even for a conversation as it was hollow and she was not like Shokuhou Misaki to which Tsugutoshi replies she must if she ever wants to resume her connection with Touma implying they knew each other more than it seems at first. 
Ichihanaran Festival ArcEdit
- Main article:Ichihanaran Festival Arc
Eve of the FestivalEdit
Kumokawa Seria is greeted by her sister, Maria, after she inexplicably comes out during the festival preparations. Seria comments on how it's only because people won't shut up being her turn. Maria thinks this this a veiled insult, and asks if she is talking about the beauty contests being held at various schools for the Ichihanaransai, and curses Seria if she her "assets" have grown. Seria notes on how she will not be entering, and that her role is only behind the scenes, as such, she doesn't like standing out too much. Moreover, she states that Shokuhou Misaki will just manipulate the votes using her powers, rendering her entering useless.
Maria then accuses her of saying that she doesn't stand out a lot already, to which Seria just says that it is just a difference in chest size. Maria says that Seria shouldn't become arrogant regarding that, and stop looking down on her. The two then argue about the values between large breasts and flat chests. However, much to Maria's consternation, Seria begins talking about Kihara Kagun, that she deems that Maria loves so much that it gives her nosebleeds, and involves his name in their little breast talk. The talk then transfer to what Maria was doing in Baggage City. Here, she asks if Maria really did fell in love with Kamijou Touma, and states that she will go "full-on soap opera mode." Maria then answers that it is a defamation of her character, and asks where she heard that rumor.
During the FestivalEdit
Seria reappears to have change her mind about the swimsuit competition in Eiri High School, though she claims that she doesn't even know how she found herself in the stage in the first place. There, she maintains a distance away from Shokuhou who comments on why she isn't coming near the stage with her, calling her an old woman, to which Seria states that it is used to get out of the range of Shoukuhou's powers.
Toaru Majutsu no Index: Love Letter CompetitionEdit
- Main article:Toaru Majutsu no Index: Love Letter Competition
Seria is the main character of a short story found in the artbook Rainbow Spectrum Colors by Kiyotaka Haimura, in this story she set ups a plan on where she will catch a spy by using a love letter from her to Kamijou Touma, under the logic that the spy will believe the love letter to be an actual important confidential message from Seria to Touma; for this purpose Seria creates a great ruckus and makes it quite know that she wrote a letter to Touma.
At the end of the story not only Kumokawa catches the spy, but it is also slightly hinted that she is aware of Touma's memory loss .
Her powers and related abilities are not known as of now, though she is shown to be an extreme planner, in that she orchestrated a plan to catch the spy by using a "love-letter" to deliver to Kamijou Touma, so as to create a ruckus and let the spy think she is delivering secret documents.
She is also said to be an expert in the usage of hypnoptic suggestions, making her enemies fear her and create a mistake if they panic.
Character Art DesignsEdit
Seria's design remains static throughout the series. Haimura stayed from making look moe, as she has an extreme facial expression that is difficult to convert into a standard moe format.
- “Kumokawa Seria, the Super JK Tactician bossed around by the Board of Directors, is here!! I’ll dull the judgment of any pure boy☆!” 
- To Fukiyose Seiri, "Oh, well, let's ask someone else. Hm, who should I look for...? Maybe that person with black hair, a huge forehead, and large breasts, the one imitating me?"
- ↑ 1.0 1.1 Toaru Majutsu no Index Light Novel Volume SS2 Chapter 11
- ↑ 2.0 2.1 2.2 2.3 Shinyaku Toaru Majutsu no Index Light Novel Volume 02 Chapter 2 Part 3
- ↑ Toaru Majutsu no Index Light Novel Volume SS2 Chapter 19
- ↑ 4.0 4.1 Shinyaku Toaru Majutsu no Index Light Novel Volume 05 Chapter 3 Part 6
- ↑ Shinyaku Toaru Majutsu no Index Light Novel Volume 06 Chapter 6 Part 10
- ↑ Toaru Majutsu no Index: Love Letter Competition Pt10