| Real Name | Villain | Powers/Abilities |
| Harvey Dent | |
| Oswald Cobblepot | |
| Not (officially) revealed | |
| Edward Nigma | |
| Selina Kyle | |
| Pamela Isley | |
| Dr. Thomas Elliot | |
| Dr. Kirk Langstrom | |
| Roman Sionis | |
| Several different people | |
| Dr. Jonathan Crane | |
| Floyd Lawton | |
| uses it | |
| | Real Name | Villain | Powers/Abilities |
| uses it | |
| Victor Fries | |
| Dr. Harleen Quinzel | |
| Jervis Tetch | |
| uses it | |
| Waylon Jones | |
| uses it | |
| Arnold Wesker | |
| Warren White | |
| uses it | |
| Julian Day | |
| Jason Todd | |
|