Q Continuum

The Q Continuum is a strange species of omnipotent aliens in Star Trek.

The main Q
He is a reccuring antagonist who generally appears as a dark-haired human in a Starfleet uniform and seems to like speaking French and changing his clothes. He doesn't like responsibility or morality and seems to find it boring, almost similar to a small child.

He seems to get bored easily and when he visits the characters, he seems to be "playing" with them; he talks about liking "games".

He is very arrogant and believes humanoids are his inferiors but also seems fascinated by them, particularly humans.

He is even more prejudiced against Klingons than humans, which Worf finds very annoying.

Quinn
Another Q, who was sort of suicidal and his powers didn't work properly. He only appeared in one Voyager episode.

Amanda Rogers
A teenage girl, who generally appears with fair skin, a blonde bun and a purple dress. She thought she was a human because her parents had been turned into humans before they had her and then they died as humans, but then in her adolescence she started gaining Q powers and eventually joined the Continuum but she has a better sense of morality than most Qs.

Q Junior
An adolescent boy who is the son of the main Q and has a similar personality except more friendly and more interested in science.

Q Junior's mother
Another Q who conceived Q Junior but disowned him. She seems a bit more sensible than the main Q but is just as rude/snarky.

Q's boss
Another male-seeming Q. We don't know much about him but he seems to have some authority over him. He appeared in "Encounter at Farpoint" and "Deja Q".

Trelane?
In the original series, Kirk and his crew met an omnipotent man who called himself Trelane and had nineteenth-century type ideas of how human society worked. He seemed to be "playing" with the crew but tried to kill Kirk. Some people think that this character might be part of the Q continuum. Kirk wonders if Trelane is a child due to his immature-seeming personality, but he appears as an adult.

Trelane's parents?
At the end of said episode, two entities appeared as glowing green lights. One spoke in a male voice, the other in a female voice and they referred to themselves as his parents. Like Trelane, they could be members of the Q continuum, but it's unknown.