Absolutely nothing is known about Replika. At some point he joined SHADE.
Replika was created by Grant Morrison and Doug Mahnke. He made his first appearance in Seven Soldiers: Frankenstein #3.
Major Story Arcs
Seven Soldiers of Victory
Replika is intentionally infected by the Water to gather data for SHADE. When he attempts to escape his bonds he is shot in the head by Father Time, and dies.
Powers and Abilities
Replika has no known superhuman powers or abilities.