Watari operates as L's chief caretaker and logistical strategist, orchestrating communications and operational demands with unwavering confidentiality. His responsibilities transcend mere practicality, positioning him as L's exclusive confidant and emotional stabilizer during high-stakes investigations. This interdependence surfaces in pivotal moments like a rooftop confrontation, where subtle shifts in L's posture betray his reliance on Watari’s guidance. Watari’s legacy includes establishing Wammy’s House, an orphanage dedicated to cultivating L’s potential successors, though the "Relight" adaptation does not delve into this facet. His fatal encounter with the Shinigami Rem—who eliminates both Watari and L to safeguard Misa Amane—severs L’s support network and irrevocably shifts the investigation’s trajectory. The condensed film preserves Watari’s foundational role in facilitating L’s methodologies and protecting his anonymity, mirroring his original series portrayal without expanding upon his history or motivations.