Miko was originally signed up for a guest appearance in the show's pilot episode, but was later promoted to a recurring role.
Tom Wheeler told TV Line that he has "big plans" for circus member Raia on the NBC drama.
"She has a very strong crush on Vince (David Lyons) and there are plans to have that crush tilt into obsession," he said.
Wheeler recently confirmed that he remains optimistic about the future of The Cape.
The series airs on Mondays at 9/8c on NBC.