Jeremiah Valeska
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- Jeremiah Valeska
- Mr. J
- Child prodigy, sent away by his mother after suffering severe abuse at Jerome's hand
- Exposed to a chemical by his brother, turned his skin white, lips bright red & hair green;
- Became a calm & calculating psychopath, obsessed with Bruce Wayne
- Fell into an experimental vat at the Ace Chemicals plant, severely disfiguring him
- Gotham City, USA, Earth
- Cameron Monaghan (Gotham)
- Lila Valeska (Mother) †
- Paul Cicero (Father) †
- Jerome Valeska (Twin Brother) †
- Human
- 1993