You may be looking for the character from Bat Attack! or the species.

Janus was a Roman god. Praefectus Thalius Maximus once prayed to him, beseeching him to "stand watch at this door and protect the humble wretches that dwell within". (PROSE: Byzantium!)

Janus was one of the faces from mythology worn by members of the Pageant. (PROSE: The Man in the Velvet Mask)

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