Eb

Eb is a Changeling who belongs to the Simic Combine and notably ran their information centre in The Jewelled Land of Ruby. 
When visited by Trivaz and Mystan, Eb expressed a desire to 'investigate' Mystan as he was an interesting specimen to Eb. 
The Changeling's eccentricity was made clear when he offered a large sum of money to investigate Mystan with more offered if he could cut Mystanopen and investigate his organs. 
During the investigation, Eb gave them more information on Changelings by explaining more about the Changeling Curse. 
Eb was notably the individual that Trivaz refined Illithid essence with and he was the first humanoid creature to test it, surviving the experience but notably losing his emotions in the process.