Becky Walker, known to most by her nickname Bear, is a teenage survivor who grew up in the aftermath of the Great Crumble — the catastrophic pandemic that destroyed most of human civilization and led to the birth of hybrid children (half-human, half-animal).

As a child, Becky lost her parents to the Sick, the deadly virus that swept across the world. That trauma hardened her and fuelled her distrust of adults, particularly the Last Men, who hunted hybrids out of fear and ignorance. Determined to protect the hybrids, Becky founded a group of rebel teenagers called the Animal Army. The group paints their faces like animals and lives by the code that “hybrids are the future.” Under her leadership, they rescued and hid hybrid children, striking out against the Last Men whenever possible.

Despite her fierce and often intimidating exterior, Becky is deeply compassionate and idealistic. She hides her vulnerability behind anger and toughness but is driven by an unwavering sense of justice. Her leadership and courage come from pain — the loss of her family, her childhood, and the world she once knew.

Her nickname, Bear, comes from both her fighting spirit and the bear-like armor she wears — a symbol of strength and protection. But as the series progresses, she begins to shed that armor, literally and emotionally, revealing her humanity and growing closer to Gus, Jeppard, and Wendy, a hybrid girl who turns out to have a personal connection to her.

In Season 2, it’s revealed that Becky’s real name is Rebecca Walker, and she is actually Wendy’s biological sister, separated during the chaos of the Great Crumble. This revelation adds a new emotional layer to her story — her mission to protect hybrids unknowingly became her life’s purpose because of her lost sister.

By the time Becky joins Gus and Jeppard on their journey, she’s transformed from a hardened rebel into a protector, finding a new kind of family in them. She learns that survival isn’t just about fighting — it’s about caring, forgiving, and believing in something better.