Author: Estyrien al'Halien
The full name was not recorded in the main series, but was given in the Wheel of Time Companion. Other information about the character is also included in the Companion, but we did not use it in the TarValon.Net Library.
Reiko was one of six sisters sent to Shadar Logoth to find out what the large amount of channeling was (the cleansing of the taint.) She was chosen because she is good at reading residues (CoT, Ch. 19).
Reiko is from Arafel. (CoT, Ch. 19).