Sharon Quinzel is the ex-wife of Nick Quinzel and mother to their two children: Harleen and Barry Quinzel, with the former growing up to become the infamous Harley Quinn. Seemingly being the only sane and reasonable one in her family, Sharon is ultimately very forgiving and has a big heart. The New 52 reboot would go on to re-introduced Sharon as a former medical researcher who left her job to start a family. This version of the character also stayed married to Nick and they both had two other children: Frankie and Ezzie Quinzel. During the last year of her life, Sharon spent her time reconnecting with her now estranged daughter before dying from cancer.
Sharon Quinzel was created by Paul Dini and David Lopez, first appearing in Gotham City Sirens #7. (2010)