biribiri
The nickname of Misaka Mikoto from To Aru Majutsu no Index and To Aru Kagaku no Railgun, translated in fansubs as "Shocker" or "Sparky." It comes from her ability to generate an electric psychic energy and her permanently bad temper.
For tagging purposes, the tag is used for posts where she displays her electric powers, either voluntarily or involuntarily.