Eishiro Sugata is a tall, serious-looking individual possessing light grey hair and green eyes, nearly always seen wearing rectangular glasses and his school uniform as he owns no other clothes. He maintains a consistently calm, neutral expression regardless of circumstances. His background involves significant family tragedy. As the second son of a prominent political family, he idolized his older brother, sharing a passion for flight and gliders. Following a trivial argument before a test flight, Sugata performed a subpar inspection of the glider. This oversight led to a wing detachment during flight, causing his brother's fatal fall. Blamed for the death, Sugata was disowned by his family, with his younger brother Yuugo becoming the heir. This event drove his lifelong quest to discover a "New World" as atonement, leading him to establish the New World Discovery Club at Sorami High School to pursue this goal. After being disowned, he lived self-sufficiently in a riverside tent, growing vegetables and developing survival skills that included defending himself against wild animals like bears barehanded. Sugata serves as the president of the New World Discovery Club, though he is typically its sole official member. His defining traits are high intellect, analytical thinking, and an eccentric dedication to exploration and scientific inquiry, often referencing historical explorers like Magellan and Columbus. He researches the mysterious "New World" (a black hole-like phenomenon above Sorami City) and later Angeloids and Synapse (the angel world), frequently providing philosophical narration at the start of anime episodes that hints at upcoming events. His methods involve meticulous experimentation and leveraging advanced Synapse technology, sometimes leading to unintended negative consequences. Despite his stoic demeanor, he possesses surprising physical prowess, matching the combat abilities of Mikako Satsukitane. In Project Pink, Sugata advises Nymph during her emotional struggles, encouraging patience regarding her lost wings. He reassures her that Tomoki's refusal to command her stems from kindness, not hatred. He also constructs and tests flight devices during this time, achieving a successful glider flight near a cherry blossom tree. His relationships are complex. He shares a childhood friendship with Mikako Satsukitane, whose family servants address him as "young master," indicating deep ties. He views Tomoki Sakurai as an unofficial club member and intellectual counterpoint, often aiding him despite occasionally involving him in perilous experiments. He collaborates closely with the Angeloid Nymph for research and forms a working partnership with Daedalus during Synapse visits, with his intellect earning the respect of Synapse's Master. His character development culminates during the Synapse conflict. Driven to reprogram the Rule Obelisk, he is seemingly killed by Ikaros Melan. In his final moments, he expresses regret that his dream caused only pain and tearfully asks Tomoki to end it, marking a rare emotional breakdown. Tomoki's wish later resurrects him. Six years post-series, in the spin-off *I Love You!! Magical Angel Cosmos*, he appears as a university student continuing his pursuit of mysteries, having transitioned from tent living to an apartment while retaining his passion for exploration.