Duplication (size) – The ability to create a duplicate that is bigger or smaller.
Silver Age DC characters often found themselves dealing with a giant duplicate of themselves (House of Secrets V1 #53, Tales of the Unexpected V1 #38).
Superman had a duplicate mini-me in Superman V1 #125.
Wonder Woman often had to deal with giant evil duplicates (Wonder Woman V1 #90, Wonder Woman V1 #122, and Wonder Woman V1 #175)!
Virus (Dakotaverse) his duplicated becomes smaller and smaller and he makes more of them (Milestone Media Universe Card Set).
Enigmo (Marvel) can divide every portion of his body into smaller versions of himself, and each part retains the full power of the whole Enigmo. Enigmo can also pull each of the smaller versions of himself back together at will. Enigmo apparently has taken over the world in The Unbeatable Squirrel Girl V2 #12.