Martha is the foster mother of Yusei Fudo, Jack Atlas, and Crow Hogan, and serves as a maternal figure to many other abandoned children in the Satellite sector. She lives in a cottage where she cares for orphaned and homeless children, and is widely regarded as a parent by all those she has taken in. Her personality is motherly, kind, caring, and selfless, yet she can also be stern and protective when necessary. She is friendly and warmly teasing, notably showing supportive interest in Yusei's relationship with Akiza Izinski. Martha’s primary motivation is the well‑being of the children under her care; she provides them with shelter, guidance, and emotional stability in the harsh environment of Satellite. Her role in the story is that of a grounding, supportive presence for the main trio, especially during their formative years and later when they return to Satellite. Key relationships include Yusei, Jack, and Crow, all of whom she raised and who regard her with deep respect and affection; even the headstrong Jack and Yusei defer to her authority. While her development is not a major arc in itself, she remains a constant moral anchor, and one instance during the Dark Signer conflict puts her in peril when her soul is absorbed by an Earthbound God, later restored. Martha has no dueling abilities or supernatural powers; her strength lies in her unwavering kindness and resilience as a caretaker.