Kurozuma Wataru

Kurozuma Wataru is a protagonist for Episodes 15 and 16 of the anime series Toaru Kagaku no Railgun. He is voiced by Katsuyuki Konishi.

The former leader of "Big Spider", a Skill-out gang, in the Railgun anime. He is notable for having a large spider tattoo on his back and enjoys drinking milk. Two years ago, he meet Mii when his gang protected a little boy from another gang and had her join Big Spider, even when he found out later that Mii was an esper. He supposedly died when he tried to rescue his friend Hebitani from another gang but in reality was actually hospitalized and detained until recently. When he learns that Big Spider have abandoned their Skill-Out ideals and become a ruthless gang harassing innocents, he decides to end the gang for good. With the help of Mii, Kuroko and Mikoto, they were able to defeat the gang and stopping the new leader of Big Spider, Hebitani. After all the Big Spider members are arrested, he decides to turn himself in to Mii.

He is a highly skilled brawler, capable of fighting against large number of armed opponents.