WK SA Spoiler Alert: This page contains spoilers. Read at your own risk.

Sylvia Mercury First

Sylvia Mercury First

Character Name
Full Name Sylvia Mercury First
Furigana シルヴィア・マーキュリー・ファースト
Personal Info
Age 26
Gender Female
Height 165 cm
Weight 59 kg
Occupation Warrant Officer (Stars)
Ability Name Voice Transmission
Novel Volume 9, Chapter 2

Sylvia Mercury First (シルヴィア・マーキュリー・ファースト) is a Planetary-Class Magician who serves in the USNA's Magician Unit "Stars". She holds the rank of Warrant Officer. Her code name is Sylvia Mercury First, whereas her nickname is "Sylvie". [1]

Appearance and Personality

Sylvia possesses an unrestrained personality, where she can easily forget things such as differences in rank. [1]

Since the mission to Japan, she and Angelina Kudou Shields have spent a lot of time together, that even despite their difference in age, Sylvie treats Lina as if she is her younger sister. [2]


Sylvia is 25 years old as of January 2096. [1]

Besides her first name, "Sylvia", the rest are code names, which identify her to be ranked first among the Planetary-Class "Mercury" of Stars. She is a highly regarded female CO who attained the title of "First" at an early age. [1]

In the beginning, Sylvia didn't want to join the military and intended to become a journalist after graduating from college. She has an outstanding ability in data analysis. [1]


  1. 1.0 1.1 1.2 1.3 1.4 Volume 9, Chapter 2
  2. Volume 17, Chapter 4