| Clues | Enemies |
| Wears a cat-themed costume. Has a love-hate relationship with Batman | |
| An insane scientist who specializes in the nature of fear | |
| Has abnormal strength. Broke Batman's back | |
| Has the ability to control all plant life and is immune to all poisons | |
| Leaves clues to his crimes in the form of riddles and puzzles | |
| Falls in love with the Joker and becomes his most famous accomplice | |
| Makes major decisions by flipping a two-headed coin on which one of the faces is scarred | |
| Short round man with a long pointed nose. Carries varieties of umbrellas | |