Elfie mainly serves as Roddy's spotter and moral support, guiding and directing him in the labyrinthine gates. She develops and delivers Sophia's modules throughout the game.
Midway through the mission, Elfie confesses to Roddy that she feels guilty for the death of their father, as she was his spotter the day he was ambushed and killed.
The Frudnicks' headquarters is infiltrated while Roddy is still underground, leaving Elfie vulnerable. She is wounded and kidnapped by Kaiser, prompting Eve to take over her role as spotter. After she is rescued by Roddy following the defeat of Kaiser, the siblings watch their mother's spirit disappear to be with Jason.
Elfie is loosely implied, but never stated, to be adopted. Her age given in Blasting Again is eighteen, placing her birth shortly after Blaster Master. Given the ages of Jason and Eve, it is unlikely, but not implausible, that they started a family at this point. If the date of events given in Blasting Again actually applies to Blaster Master 2, then her birth is more plausible.
The most evidence is provided by a line during Elfie's confession. "Since I was taken in," could imply that she was adopted by the Frudnicks, though it can also be in reference to when she officially joined the 'team' as a spotter under the guidance of Eve, as it was the subject of the confession.
Elfie is kidnapped by Kaiser and his minions shortly afterward, as they continue to mistakenly refer to her as "Eve." This infers that she resembles her mother enough that Kaiser, who knew Eve before the destruction of their home world, could mistake the two, an unlikely scenario if she were adopted.
|Protagonists||Jason · Eve · Roddy · Elfie · Alex|
|Antagonists||Plutonium Boss · Underworld Lord · Lightning Beings · Kaiser|
|Sophia||Sophia 3rd · 4th · J-7 · S.O.P.H.I.A. · Zero|
|Pets||Fred · Plutarch|
|Guest Characters||Gunvolt · Ekoro · Shantae · Shovel Knight|