|Occupation||First Officer in Andalite military|
|Behind the scenes|
|First appearance||The Beginning|
|Last appearance||The Beginning|
Menderash-Postill-Fastill is the former First Officer to Captain-Prince Aximili-Esgarrouth-Isthill on the Intrepid, a Andalite permanently trapped in human morph, and one of the "New Animorphs" who took The Rachel to search for Ax.
Menderash was the First Officer to Captain-Prince Aximili-Esgarrouth-Isthill on-board the Intrepid when it was attacked by The One in Kelbrid space. He was the only survivor of this attack. Suffering from extreme survivor's guilt, Menderash sought out Prince Aximili's old companion Jake. After telling the story to Jake, informing Jake to the existence of The Rachel, and the insistence that the "Andalites" not enter Kelbrid space, Menderash morphed into human form and purposely became a Nothlit.
|Djabala||Prior to The Beginning|
|Human - NOTHLIT||The Beginning|
- It appears that Menderash loves Cinnabon just as much as Ax.
- It is unclear if Menderash simply morphed into a human form from someone he acquired or if he performed a Frolis Maneuver to create a unique human form for himself.
|Animorphs||Jake | Rachel | Tobias | Cassie | Marco | Ax|
|Auxiliary Animorphs||James | Collette | Timmy | Kelly | Craig | Erica | Julio | Liam | Tricia | Jessie | Judy | Ray | Pedro | Elena|
|New Animorphs||Jeanne Gerard | Menderash-Postill-Fastill | Santorelli|
|Other Animorphs||David | You|