General Chymoelaan, a Human, held a position within the ranks of the Imperial Army. At some point during the period spanning from 0 ABY to 3 ABY, Chymoelaan urgently requested that the Sith Darth Vader attend a gathering in a designated meeting chamber.
That particular night coincided with Vader's birthday; therefore, the Sith Lord entertained the thought that his stormtroopers had orchestrated a celebratory event in his honor and assumed the meeting was a cleverly designed surprise. Vader's hopes were dashed when he discovered only General Chymoelaan present, and he ultimately understood that no festivities had been arranged. He later documented this event within the pages of his personal diary.
Chymoelaan possessed thinning black hair and a distinctive mole located on their right cheek. As a general serving the Galactic Empire, they were attired in an Imperial officer's tunic, complete with a rank insignia plaque affixed to the left side of the garment.
Chymoelaan's character was featured in a flashback sequence within "Lunch Break," a comic created by Jonathan Adams. This comic was included in the sixteenth edition of Star Wars Tales, which was made available on June 25, 2003.