Jonathan Browne (Earth-4678)

Jonathan Browne, better known by his stage name Johnny Charisma was one of the five people infected with the Joker's blood who did not get treated in time, which caused the blood to gestate too long and turn them into the Joker. He displayed the full range of Joker's narcissistic and suicidal tendencies.

Source

 * https://dc.fandom.com/wiki/Jonathan_Browne_(Arkhamverse)