What species is Big Man listed as?

Big Man is listed as a manta ray.

Unlike the humanoid Shiver and Frye, Big Man is a large bipedal manta ray who walks using his pelvic fins. His body has broad white-and-gray markings, and his size and silhouette make him immediately recognizable within Deep Cut. He also wears a red-and-white headpiece connected to the trio’s festival-inspired visual style.

Big Man is one of the three hosts of Anarchy Splatcast in Splatoon 3, alongside the Octoling Shiver and Inkling Frye. He is also the group’s primary songwriter and producer, performing under the alias Ian BGM. His musical role helps explain why he is often positioned as Deep Cut’s DJ or instrumentalist rather than its main vocalist.

The answer is sometimes confused with Big Man’s boss form in Splatoon 3’s story campaign. During that battle, he creates a giant manta-ray silhouette that splits into smaller versions when struck. That spectacle reinforces his species; it does not mean he is an Inkling, Octoling, or moray eel.