Bat had short blond hair and green eyes. He wore a dark gray suit, gray pants, and black dress shoes. When he activated his android part, his left ear grew a scorpion tail-like appendix.
Bat has shown to be a liar and a coward. He acts mostly on his own whims.
Bat once hijacked a plane heading for an unknown destination, but was defeated by the team work of both Siesta and Kimihiko. Volumes later, Yui Saikawa revealed that Bat's real name is Albert. Bat also had a sister, which died in an experiment by <<SPES>> a long time ago.