Memory Alpha
Memory Alpha
Multiple realities
(covers information from several alternate timelines)

These are members of unidentified humanoid species observed in the 23rd century.

Aliens with leather headbands

Alien ambassadors

Ambassadors from this species served on the Federation Council in 2286. (Star Trek IV: The Voyage Home)

These suede costumes, tassels and resin jewelry were featured on the Zaranites seen in Star Trek: The Motion Picture.
According to a costume of one of these individuals that was auctioned off in the It's A Wrap! sale and auction, these individuals are Mazorites. [1]
According to an item description at the Propworx auction this hat belongs to the Kazarites. [2]

Babel Conference attendees

Bounty hunter

Female bounty hunter

This female alien bounty hunter captured a Harcourt Fenton Mudd android in the sewers of a planet, only to misplace her ship. She was uninterested in Mudd's pleas of romantic interest, including the offer to show her the 27 moons of Tartus IV.

She was at least a head shorter then Mudd, but claimed to be of normal height; she also observed that Mudd was "freakishly weak" compared to her. She occasionally let out an animalistic hiss when angry. She was antagonistic towards the Federation, and was interested in gaining leverage against it. (ST: "The Escape Artist")

The short female bounty hunter was played by Barbara Mamabolo.

Earth bar visitors

Port of San Francisco bar aliens
San Francisco bar aliens
Shipyard Bar aliens

Elysian councilor

Khitomer Conference attendees

Nimbus III inhabitants

Rura Penthe personnel

Starfleet personnel

Yorktown inhabitants