DeeDee, originally named Rin-Rin in the Japanese version, is a female monkey deeply bonded with the protagonist from their earliest days. She watched his birth emerge from a stone and later attended his coronation ceremony after he proved his courage by diving into a treacherous waterfall. Throughout his initial reign, she observed his descent into arrogance and insecurity, especially when confronted with humans' superior intelligence. DeeDee offered steadfast emotional support during this turbulent time, though he frequently dismissed her concerns. When the protagonist departed to seek magical training from a hermit, DeeDee followed despite warnings that "magicians don't like girls" and "it's no place for women." After his training concluded, she visited him, singing expressively outside the hermit's dwelling as a testament to her unwavering devotion. She witnessed his newfound magical powers and chose to remain by his side despite his inflated ego. Following his imprisonment beneath a mountain for defying divine authority, DeeDee became his sole caretaker, tending to him faithfully as his arrogance gradually faded. Her loyalty faced a severe test when she nearly perished in a blizzard during this vigil, saved only by a compassionate figure. She continued her unwavering support after his release, accompanying him on a pilgrimage undertaken to atone for his past actions. During this pilgrimage, her voice indirectly swayed his decision to spare an adversary, highlighting her enduring moral influence on his growth. After the pilgrimage's completion and his return, DeeDee was initially found bedridden and gravely ill, attended by three monkey doctors. His arrival instantly revived her, symbolizing the restorative power of their reunion. The narrative culminates in their joyful reunion among his monkey subjects, affirming her role as his essential emotional anchor. Throughout the protagonist's journey, DeeDee serves as his moral compass and source of unconditional loyalty, consistently advocating for humility and compassion against his transgressions. Her character embodies steadfast support and emotional resilience, her presence directly catalyzing his transformation from arrogance to virtue.