Eva was a young female Iktotchi who had a high M-count. Eva was taken from her home and kept as a prisoner of the Imperial base at their base on Mount Tantiss, living inside a vault along with several other M-count children, including Jax and Sami, although the Empire insisted they were only specimens. Eva was designated SP-54 and had her blood drawn daily as part of the Empire's Project Necromancer.
Eva had a relationship with Nala Se until the Kaminoan was imprisoned by Doctor Royce Hemlock, the head of Project Necromancer. When new lead scientist Emerie Karr began performing Nala Se's duties, including interacting with Eva and the other children, Eva was friendly towards Karr, complementing her glasses and trying to talk with her. She and the other children later escaped with the help of Doctor Karr and the Bad Batch.