The interviewer asked if Marina is an Octoling, but they all dodged the question and Nogami simply said, She has extraordinary hair. Nogami also noted that Inklings are not paying attention to this too much. Inoue said that the Inklings dont care about appearances if they are doing something fresh.
The Squid Sisters had composers who produced their songs. However, Off the Hook are composing their music by themselves. Because of this, Inoue designed them to represent self confidence.
Pearl is genius artist, but she couldnt find a right partner because shes a bit too edgey. Since she finally has Marina as a partner though, their chemistry is sparkling right now.