Judgment Boy

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

Appearance
The Judgment Boy is a tall boy with short spiky slicked back hair.

Level Upper Arc
During the Graviton bombings, the Judgment Boy arrived with Konori Mii at a shop where Judgment detected residue of a potential bomb. While searching for the bomb, he noticed the Twin Tails Girl who fell and hurt her leg within the shop. While running over to assist her a nearby stuffed rabbit which had been infused with gravitons started to explode. He quickly jumped in front to cover the Twin Tails Girl and after the explosion was seen with a large wound on his back.

Sisters Arc
On August 20, while Saten Ruiko and Uiharu Kazari walk by a shop, the Judgment Boy is seen in casual cloths and on a potential date with the Twintails Girl he previously was seen saving.

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