Personal Info:
Real Name: None
Also Known As: Clayface
Place Of Birth: Arkham Manor, Gotham City
First Appearance: Arkham Manor Vol.1 #2 (2015) Modern Age Villain
Known Associates: No known Associates
Group Affiliation: None
Base Of Operations: Gotham City
Grudges: Batman
Creators: Gerry Duggan and Shawn Crystal
Enhanced Abilities: Clownface has superhuman strength, durability and endurance.
Claybody: Clownfaces body is made out of a clay like substance that allows bullets to pass through him essentially making invulnerable to physical damage. He is also able to project parts of his body and change shape so that he can take on the appearance of anyone else.
The villain that would come to be known as Clownface originally began as a stray piece of Clayface's body that became unattached and gained enough sentience to morph itself into a mute old man. This man was found and taken to Arkham Manor because of his unresponsiveness. Bruce Wayne who was undercover as Jack Shaw in the manor, was able to recognize the man as a portion of Clayface but avoided blowing his own cover to alert the guards.
The Joker, undercover, too, as the Arkham attendant Eric Border, shed his disguise and secretly infected this portion of Clayface with Joker Venom, morphing it into an entirely separate killing machine he called Clownface.
Clownface at DC Database
Clownface at Comic Vine