Temporary brief:

Identity: SECRET.

Origin: Nuclear Fructsion victim.

Affiliation: None, no sanction

Description and Powers:  His poisoning followed a bizarre guidance based on childhood tragedy and mysticism (details I don't know).  First appeared several weeks after the Bat, has a similar bent for destroying the criminal element.  Also not interested in being ordered around by anyone else, he and The Bat were a natural team.  With no clear idea of what to do with his powers or how to put himself to the best possible use, he welcomed mentorship by the Bat.

Unaffiliated beyond his partnership with the Bat.  Not sanctioned by any government agency and not trusted.  Hunted openly by all official government agencies and criminal organizations alike.

(Toiseach: as with the Bat, help me here, please!)