Oatchi is a loyal and intelligent canine companion introduced in 'Pikmin 4.' He assists the main character and their crew in exploring alien planets, overcoming obstacles, and supporting the Pikmin. Oatchi is notable for his versatility—he can carry items, swim, attack enemies, and even transport Pikmin on his back. As a key member of the rescue team, Oatchi plays an essential role in navigating hazardous terrain and ensuring the safety and success of the team's mission throughout the game.