Dark reflections always expose the evil side of mighty moral men, such as those of the Men of Steel and their Big Red Cheese counterpart. We speak of Bizarro from Htrae-One, Flying Tiger of Earth-Two, and Niatpac Levram of Earth-S. While Bizarro and Tiger were linked to Earth-One and Earth-Two's Superman, as well as being one of several imitation life forms that plagued humanity, such wasn't the case Levram. Created by Lex Luthor, Funny Face and Wizzo respectively...each pseudo-Superman replicated the abilities and appearance of their originals. Although none possessed the heroic disposition that made their living template the legends they became. Although only Bizarro endured while the others ceased to exist, they all challenged the champions even while lacking the mental acumen of the Supermen and Captain Marvel. Which is why they've never been replaced.
Interestingly, there were other clones that existed. For example, infant Kal-El's ship collided with an alien satellite possessing a duplication machine. This machine created rocket ship and infant, which landed in the vicinity of the Dereks' residence. This family was heavily involved in criminal activities, and raised their adopted son to become a Super-Brat, then a Super-Bully and finally Super-Menace. Meanwhile, Kal-L seemed to have similarly encountered such a satellite, as a clone of his arrived on Earth-Two. However, this individual believed he came from the planet "Viro" though not proof of its existence has ever been revealed. An orphan himself., this Wonder Boy seemingly aged slower than his counterpart, and was hence still a teenager while Superman first appeared. Becoming a hero like the man whom he was patterned after, this lad had a couple dozen adventures. In fact, Wonder Boys tales would parallel those of Bizarro's in the number of chronicled cases, whereas Super-Menace and Flying Tiger only had a couple appearances each. Another clone, of a kind, was Black Adam of Earth-S who was the original template upon which Captain Marvel was based, until he turned back. He too was once a "wonder boy" who became a "super menace" over time.