The following is a list of unnamed Megans.
Men
This sorcerer-contractor and his client built and observed the magical construction of a structure. (TAS: "The Magicks of Megas-Tu")
Satyr
This young male satyr was a conjuring of Lucien brought before Captain James T. Kirk in 2269, when Lucien took Kirk, Spock, and Leonard McCoy to Megas-Tu.
The child satyr was conjured up by Lucien (as was a wind that downed Kirk) in response to Kirk asking why he and his fellow officers from the USS Enterprise had been brought to the planet. The boy had a spinning top that stopped rotating as Kirk looked at the child and Lucien then commented, "Children will play." (TAS: "The Magicks of Megas-Tu")
In the script of "The Magicks of Megas-Tu", this being is twice referred to, both times as a "little boy satyr." The script includes some actions that were written for the child satyr but which are not shown in the episode's final version. Specifically, the teleplay states, "[He] smiles up at Lucien, waves, then picks up his toy, hurries off."
The Japanese name for the episode "The Magicks of Megas-Tu" references this type of lifeform; the title, translated back into English, is "The Satyr on the Magic Star Megas-Tu". (Star Trek Concordance, 2nd ed., p. 84)
Spectators
These spectators observed the trial of the Enterprise crew. (TAS: "The Magicks of Megas-Tu")
Spirits
These spirits were first encountered aboard the Enterprise. (TAS: "The Magicks of Megas-Tu")
One of these spirits was voiced by George Takei.
Visitors
These individuals were among the ones that originally visited the planet Earth during the 17th century. (TAS: "The Magicks of Megas-Tu")
Women
These two women completed the exchange of a love philtre while James T. Kirk, Spock, and Lucien looked on. (TAS: "The Magicks of Megas-Tu")