She is part of the band Off The Hook (Tentacles in the Japanese version) with Pearl, which has its own television show.
Her default costume & appearance features a black cropped vest, green / aqua pantyhose under black shorts, black boots and black fingerless gloves. She has a navel piercing and a mole under her mouth. She has green / aqua eyes, often depicted with red pupils as cephalopod eyes. She often wears headphones. She is often depicted with a furrowed brow.
Her Japanese name comes from the word for the webfoot octopus (イイダコ Iidako). As revealed in Octo Expansion, her full name is Marina Ida in English; Marine Iida in Japanese.