With the most stars, this was the clear winner, though lots of people would also really like to know certain things about Bumblecat, CassieBearRAWR and Croguesberg - and if this is still fun for everyone, we will do those at a later date!
A very special thanks to JessPhilosoraptor for embracing the idea and getting this going the other day, and to everyone for making such great Guessing suggestions.
If you enjoy a comment, give it a star - I will award the winner based on most votes!
ETA the prize, because i am new at this. The prize is a semi-artistic representation of the winner's screen name.
1. Be funny
2. Be kind
And ... Go!