The younger sister of Beryllium, she'd been born in a small pack in the grasslands before humans had killed her parents for their fur. When that had happened, Beryllium had practically taken her under her wing and they cared for one another (though mainly Beryllium cared for Gallium). Then they ran into Ash while looking for food around the Coniferous Forest, and eventually ran into Isaac, who had been scouting along the edges of his territory. He had offered to take them in, and they'd all accepted. Gallium still acts relatively childish for her age, and is always eager to play a game of tag or chase after butterflies. She's never seen without Beryllium or Ash by her side, as they're all very close to one another.
On 4/24/22, Gallium awoke to find her beloved sister's body lying cold, the fire that once lit her eyes having been vanquished. Gallium tried to call over Kalio, the herbalist, with tears in her gray eyes. Surely Beryllium couldn't be gone like that, right? Alas, old age had no cure, and death didn't, either. Stricken with grief, Gallium climbed to the very peaks of the mountains she and Beryllium were once found on, seventy rollovers ago. There, she lay down for the last time of her life. The poor she-wolf was broken, lost without her sister's light to guide her. Having lived a long, successful life as the pack's best ever chaser alongside Beryllium and Ash, she breathed her last on those peaks, longing to have her sister by her side once more.