Legion

Legion is one of the leading heroes of Halcyon City's superhero team, the Crisis Custodians. Their alter ego, Glenallen Mixon, is an eccentric billionaire who nevertheless supports the city and the Custodians through his vast funds.

Background
Glenallen Mixon was hit with a nanomachine ray or something. I don't really know the backstory very well, but they have since acted as the hero Legion. They have acted for years within Halcyon City, taking on a protege in the young hero Maniple during the 70s. However, the death of Maniple at the hands of the villainous Clownfish in 1979 led to a wave of controversy concerning the legality of teen aged vigilantes. Shortly after this, Legion fought the villain Zero Hour when he attempted to detonate a weapon of mass destruction in the neighborhood of Radeon Heights. Zero Hour died in the aftermath.

In the modern day, Legion works as one of the headliners of the Crisis Custodians as well as supporting the child organization Young Heroes of Halcyon.