Jeremiah Valeska, also known as Xander Wilde. An excellent and skilled fighter, Ecco eventually serves as Jeremiah's henchwoman, after he undergoes his change into becoming a terrorist in Gotham, donning a harlequin outfit as her costume.
- The character is a direct precursor to the supervillain Harley Quinn.
- This version of the character is exclusive to the continuity of the television series Gotham and its tie-in webseries and shorts, Gotham Stories and Gotham: A City Gone Mad. It is an adaptation of Harleen Quinzel/Harley Quinn. The original character was created by Paul Dini and Bruce Timm and first appeared in the episode "Joker's Favor" of the series Batman.
- Ecco was portrayed by Francesca Root-Dodson.
- 8 Appearances of Ecco (Gotham)
- 4 Images featuring Ecco (Gotham)
- 2 Quotations by or about Ecco (Gotham)
- Character Gallery: Ecco (Gotham)
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