Jou Kido, known as Joe Kido, is a DigiDestined partnered with Gomamon. As the group’s eldest member, he shoulders a deep sense of responsibility, frequently emphasizing caution and safety. His personality intertwines reliability and kindness with persistent anxiety and self-doubt, fueled by familial expectations tied to a lineage of medical professionals pressuring him to prioritize academic excellence. Early adventures highlight his Crest of Reliability, which manifests through actions like rescuing T.K. from drowning, triggering Gomamon’s evolution into Zudomon. In *Digimon Adventure 02*, Joe mentors Cody Hida, instilling sincerity and accountability. By 2000, he relinquishes his Crest’s power to liberate the Four Holy Beasts, temporarily halting Gomamon’s evolutionary potential. During *Digimon Adventure tri.* (2005), Joe navigates his third year of high school, consumed by university entrance exams. Academic struggles and mounting pressure lead him to withdraw from battles, prioritizing studies over his DigiDestined role. This decision strains his bond with Gomamon, culminating in their temporary separation and eventual reconciliation as Joe reevaluates his obligations. His *tri.* arc underscores the tension between adult responsibilities and his duties as a DigiDestined. Though initially hesitant, he rejoins the team, learning to balance personal aspirations with collective goals. Practical skills like first aid and his endearing clumsiness remain defining traits. Later, Joe pioneers as the first doctor specializing in Digimon, diverging from his family’s human-focused medical legacy. By 2028, he marries and raises a son partnered with a Pukamon, extending his commitment to uniting humans and Digital World beings. His journey traces a path from an anxious, self-questioning student to a grounded adult, upholding reliability and selflessness while confronting the complexities of maturity.