Twin Tails Girl

The Twin Tails Girl is a recurring background character in the Toaru Kagaku no Railgun manga. She always appears with the Judgment Boy and acts as an easter egg in the series. She has appeared in 3 chapters of the manga and on the cover of Volume 12.

Appearance
The Twin Tails Girl is a short girl with long hair tied into twin tails.

Level Upper Arc
During the Graviton bombings, the Twin Tails Girl fell and hurt her leg within a shop which Judgment was searching for a potential bomb. The Judgment Boy heard her fall and ran over to assist her as a nearby stuffed rabbit which had been infused with gravitons started to explode. She made it through the explosion unscathed as the Judgment Boy jumped in front of her and was seen with a large injury on his back.

Sisters Arc
On August 20, while Saten Ruiko and Uiharu Kazari walk by a shop, the Twin Tails Girl is seen in a dress and on a potential date with the Judgment Boy who previously saved her.

Daihasei Festival Arc
While Misaka Mikoto and Kamijou Touma are dancing around a bonfire, the Twin Tails Girl and Judgment Boy are seen dancing together behind them.