Blue Whale's most prominent feature is her hair. At the top of her head is a blowhole, with two fins protruding outward either side of it. Her front bangs gradient from gray to white, while the back hair becomes a shimmering blue color that mimics the sea. She wears a pair of glasses and has a hairpin shaped like the Japari Park logo combined with an anchor.

She wears a long white ribbed sweater that covers the majority of her upper body, along with two black over the knee boots.