Duplication (imperfect) – The ability to create an imperfect duplicate. Duplication (imperfect) is also known as Altered Duplication, Altered Replication, Different Duplication, Different Replication, Variable Duplication, Variable Replication, Varied Cloning, Varied Copying, Varied Duplication, Varied Multiplication and Varied Replication.
Bizarro (DC) is by far the most famous example of an imperfect duplicate and first appeared in Superboy V1 #68.
Over the years Bizarro created a Bizarro World complete with a Bizzaro Code (Superboy V1 #68)!
In the Modern Age Bizarro was transformed from wacky to dark as exemplified in Alan Moore’s version of Bizzaro in Whatever Happened to the Man of Tomorrow? (Superman V1 #423).
Alan Moore made Supreme into a parody of Superman. The Shadow Supreme is Supreme’s version of Bizzaro.
Magik (Marvel) – New Mutants Special Edition V1 #1
Supergirl – Cosmic Adventures in the 8th Grade (DC)
Thanos (Marvel) – Infinity Abyss #3
Jimmy Olsen (DC) – Superman’s Pal #90