Maureen Brenner was a meta-human on retainer to the Yakuza, Japan's underworld. As Aiko (a name that translates to "patronage or favor"), she first encountered Batman when she was sent to Gotham City to handle an Intergang stoolie. Brenner demonstrated incredible strength and fast reflexes when she confronted the Dark Knight. A trained fighter, she managed to go toe-to-toe with the Batman, resulting in a draw during their first confrontation. When his next mission took him to Japan, Batman encountered Aiko a second time, where he manipulated her into ending the life of a deviant criminal who liked cosplay (costumed role playing). Aiko unfortunately proved an embarrassment to her superiors, and her ultimate fate went unrecorded.