Pichu Big, a male Pichu marked by a distinctive tuft of fur atop his head, stands apart from his younger sibling, Pichu Little. As the elder brother, he embodies a mature, protective nature, serving as the steady anchor of the Pichu Posse in Big Town. His leadership shines during crises—mobilizing search parties when Pichu Little vanishes following arguments or orchestrating urgent rescues amid disasters. Though spirited and adventurous, he tempers excitement with vigilance, always safeguarding his brother and friends. This resolve drives him to spearhead missions retrieving Pichu Little from perilous escapades, whether chasing stolen helium balloons into the sky or venturing into treacherous zones. He also defuses tensions among the group, mediating clashes over shared plans or mending rifts caused by miscommunication. Collaboration defines his approach: he partners with allies like Azumarill, Meowth, and Feraligatr to tackle challenges, from rebuilding their collapsed clubhouse to aiding community efforts like pizza deliveries. Even when the Posse’s mischief sparks chaos, he tirelessly steers them toward unity and safety. Though his Electric-type moves occasionally spark unintended self-harm—a Pichu trait—he adapts with ingenuity, leveraging teamwork and clever tactics to outmaneuver threats like Houndour packs or rising floodwaters. Across short films, OVAs, and main-series movie cameos, he remains a unwavering figure: a leader who melds spirited enthusiasm with unwavering loyalty to his sibling and companions.