Edriss 562 (formerly)
|Behind the scenes|
Eva is Hispanic, described as having dark skin, long "movie star" hair, and dark brown eyes. Marco comments on how similar to each other they look. Eva was born in an unspecified Latin American countryand immigrated to the USA at some point before Marco's birth. She is bilingual, as her mother, Marco's grandmother, speaks only Spanish.
Eva married Peter, and they are the parents of Marco. Shortly after being infested by Edriss 562, Edriss faked Eva's death in a boat crash to allow her the freedom to reunite with the Yeerk empire off Earth.
Marco and the Animorphs discovered that Eva was in fact alive when the Animorphs were attacked and captured after a failed attempt to hijack a Yeerk Bug fighter. The Animorphs were present when Visser Three proudly showed off that he had captured the supposed "Andalite bandits". Visser One secretly helped free the Animorphs in an effort to embarrass Visser Three. After escaping the Yeerk ship, Marco makes Jake promise that he will not tell the other Animorphs that Eva is still alive.Although Jake kept his promise, Marco is forced to reveal the truth about his mother on a mission on Royan Island. Visser One was put in charge of a project to genetically engineer Hammerhead Shark-Controllers to aid in the Yeerk invasion of Leera. After the Animorphs take down an underwater facility, Marco stops the other Animorphs from killing Eva by telling them that she is his mother. Visser One was caught in an explosion in the facility, and Marco fears the worst although Rachel claimed to hear a submarine escaping from the destruction.
Eva was finally freed from her Yeerk when Marco successfully killed Visser One, who is escaping from his mother's brain. Eva is then reunited with her husband, Peter, who is in hiding from the Yeerks in the Hork-Bajir valley. 
Because of Eva's long years as a host of Edriss 562, she has retained massive amounts of information about the Yeerk conquest of Earth, as well as insights of the enemy, which proves to be invaluable to the Animorphs in the final stages of the war. Eva, along with Toby Hamee, is included in several of the war councils the Animorphs hold, and is respected by the Animorphs due to her extensive amounts of Yeerk knowledge.
- On the Animorphs television series, Eva is named Laura.
- She is also referred to as 'Laura' on earlier promotional items, such as on Marco's Animorphs ID card.
- She is first specifically referred to as "Eva" in VISSER, and in the main series, Book 45 The Revelation. Before that, she is just called Marco's mother.