Mini Ika Musume is a smaller, chibi-like version of the main character from the series 'Shinryaku! Ika Musume.' Unlike the original Ika Musume, Mini Ika Musume is even more childlike and adorable, often acting in an innocent and playful manner. She appears in certain segments of the anime, providing comic relief and heartwarming moments. Her role is mostly to entertain viewers with her cute antics and to offer a different perspective on Ika Musume's attempts to invade the surface world.