Domino City Aquarium worker

The aquarium lady is an unnamed character that appears in the second series anime episode 68, Legendary Fisherman - Part I. She is a worker at the Domino Aquarium and the trainer of the killer whale there.

Biography
The aquarium lady comes upon Mako Tsunami in the killer whale's tank after attempting to fish in it. She angrily berates him, before collapsing due to illness. Mako catches her and discovers that she is feverish. The aquarium lady insists that she has to perform with the whale in the upcoming show, but Mako volunteers to take her place.