Vivy -Fluorite Eye's Song-: Aries and Pisces, Ophelia and Diva

Spoilers ahead for Episodes 7 to 10. This is the script of this video. A Japanese version is also available.

During the Zodiac Festival, Ophelia is represented by Aries (the Ram) while Diva is Pisces (the fish, along with the blue and green squares that represent water and algae), as shown during their performances and the Ram symbol above Ophelia’s door. This also makes sense because Aries and Pisces are the first and last of the Zodiac signs, and Ophelia and Diva are the first and last acts of the festival. 

While star signs are meant to be vague, if you look up those two, you’ll see that Pisces are said to be both intelligent and intuitive, on top of being creative and a good judge of character, which fits Vivy very well. The creativity for example is particularly significant in Episode 10, while Vivy’s ability to judge people fairly is key to discovering the truth behind the Sun-Crash Incident and Ophelia’s suicide, as well as allowing her to get the help of Saeki and Aikawa.

Aries on the other hand represents bullheadedness (pun unintended). These people are said to be both loyal and determined to achieve their goals no matter what. That sounds odd for Ophelia (except the loyal part), but it fits much better when you realize that she's actually Antonio. It's genius! This is just another way that the staff put in as much detail as they could into Vivy’s story, it’s really quite admirable!