Clayface (Legends Of The Dark Knight)
"A former small-time thug came into contact with a secret pool of protoplasmic liquid, this unknown criminal became the infamous Clayface. It did not take long for Clayface to discover that he possessed the ability to reshape his face and body into anyone he wished to impersonate. One of Batman's most dangerous enemies, it is almost impossible to know when or where Clayface might strike. He often dons a supportive battle-suit to help sustain his structure when in clay form, galvanizing him as one of Gotham City's most menacing threats."