Q in Law and Q Squared, by Peter David

These two novels take a look at the chaos that could result from Q meeting two of the more memorable characters from TOS and TNG.
Q in Law pits Q against the only character who stands up to him in the TNG universe for strength, charisma, and the ability to annoy Picard- Lwaxana Troi. The producers of TNG lost out by never making this an episode- it's hilarious, and should have been done.
Q squared answers the question a lot of the long time trekkies asked themselves- isn't Q a lot like Tremaine? Yes, and when they come together the whole universe is threatened.
Highly enjoyable reads about one of favorite Trek characters.