The Halkans were a humanoid civilization with the unusual quality of having a history of total peace. In 2267, the Halkans refused to open negotiations with the Federation to allow the Federation to mine dilithium from their planet, out of fear that the Federation would one day use their materials for acts of violence.

The Halkans of the mirror universe were also a peaceful race, who preferred to die rather than allow their dilithium to be taken by the Terran Empire. (TOS: "Mirror, Mirror")

The Halkans were one of the rare exceptions of the general rule of the mirror universe, where their counterparts were in fact mostly similar to their original selves.
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