Misaka Misuzu

Misuzu Misaka (御坂美鈴) is Misaka Mikoto's mother and wife of Misaka Tabigake, and first appeared in volume 9 and again in volume 10, Volume SS and Volume SS2. She is currently studying at a university.

Appearance
Misuzu looks very young for her age. Her youthful appearance leads many people to assume that she is Mikoto's older sister, shocking them once they learn the truth. She is attractive and is well endowed with large breasts, in contrast to her daughter's.

Personality
She is like the polar opposite of her daughter, both in personality and figure. While Mikoto is serious, more mature and responsible Misuzu is irresponsible, laid-back and alcoholic. Also, Misuzu has a large and bouncing bust while her daughter has smaller breasts (which Mikoto is self conscious about). She teases her daughter about that.

Misuzu appears to have a low tolerance for alcohol. While drunk, she has a habit of clinging to young men that she finds attractive, as Touma and Accelerator found out in SS1 when she got drunk and clung onto Accelerator as he called a taxi to take her to her lodgings. Touma ran into her when she refused to get into the taxi and ended up exchanging phone numbers with her.

Daihasei Festival Arc (Index)
While looking for Tokiwadai she bumps into Kamijou Touya and then proceeds to ask him if he can help. Being a gentleman he try to, but the map doesn't list it. The group then over hears Kamijou Touma arguing with Misaka Mikoto, in which of their schools will have a lower score than the other is forced to do whatever the winner tells him or her to. The parents watch this scene with with relief and bemusement.

Later during the lunch break she comes while teasing her about Touma and their penalty game they are noticed by Touya and Shiina. She introduces Mikoto to them as "family of the one she likes", much to Mikoto's shock, and invites them to lunch together. When meeting at the the restaurant the others are surprised that Misuzu is actually Mikoto's mother having believed her to be her older sister. She then unpacks their lunch cheese pot with a mini gas stove to cook it on Mikoto then strikes her. Mikoto is surprised at the insane amount of food her mother prepared, and Misuzu justified it as a hearty lunch to properly give her nutrition to develop certain areas to which Misaka assumes she means her breasts.

After lunchtime was over, Kamijou Touya, Shiina and Misaka Misuzu having to booked their seats beforehand quickly headed to the next arena.

Skill-Out Uprising
In SS1 she, along with many other parents, want to take their children home due to the worsening political situation after Vento's attack on Academy City. The Board of Directors does not want that, since the children are valuable test subjects. In a worst-case scenario, they are valuable military assets for the city.

The Directors actually go so far as to hire Skill-Out to eliminate her, offering amnesty to Skill-Out if they succeed, but Skill-Out was stopped by Touma and Accelerator.

Before leaving, Misuzu mentions that she feels better leaving her daughter Mikoto in Academy City if there are people like Touma and Accelerator in the city to protect her.

Lance of Gungnir Arc
During the GREMLIN invasion of Tokyo, Kamijou Shiina and Misaka Misuzu are in a sports club, forced to stay inside as the streets have become overrun with panicking people. Misuzu pulls out her phone and discovers that the internet has become frozen and that they are only able to connect to the disaster messageboards, putting them in the dark on what exactly is happening. Shiina asks what they should do, to which Misuzu says that she lives alone so she should be fine, and Shiina replies that she should be fine as well. As she spoke however, Shiina held her phone and began pushing the buttons, prompting Misuzu to ask if she is making a call despite the probability that it won't get through. Shiina then says that she would like to leave a message on the message board, prompting Misuzu to join in.

Daihasei Festival Arc (Railgun)
In the Toaru Kagaku no Railgun Daihaseisai-arc counterpart, her role is generally unchanged from the main story, but she was taken hostage alongside Uiharu by an unknown person intent on using her against her daughter in an attempt to learn the location of the Sisters. But they were both saved thanks to Kuroko and Mikoto.

Like her daughter Mikoto, Misuzu is the target of the sincere but excessive "affections" of Shirai Kuroko, due to resemblance to Mikoto.

Toaru Majutsu no Index Light Novel Volume SS
In SS2 it turns out she and Kamijou Shiina (Touma's mother) are friends after meeting at Academy City's Daihasei Sports Festival.

Misaka Mikoto
Mikoto often comments her mother acts more like a child than she does. This causes their relationship to be slightly antagonistic, as Misuzu's irresponsible demeanor and childish behavior are the polar opposite of her daughter Mikoto's mature and responsible nature, with the latter regularly and openly shouting "shut up, stupid mother" in public and the former frequently teasing her daughter for her lack of "development" (her breasts) and relationship issues.

Despite this, they do love each other dearly, as seen when Mikoto is willing to go shopping with Misuzu for souvenirs and tells her mother to not fall for scams.

Design Evolution
Misuzu's design remains static throughout the series. Haimura refers to her as an older sister with a refreshing personality.