Halo is the leader of the Sigma Clan.
Name: Halo Borealis
Clan: Sigma (leader)
Clan Guardian: Soko
Profession: Mayor of Dionne
SES: Wealthy Noble Class
Celestial Race: Thrones Division
Sister: Corona Borealis
Son: (Find out in Volume 3)
Daughter: Uno Borealis
Husband: Nemo Borealis
Halo Borealis is a strict woman, but she has a soft side for young people from troubled backgrounds. She never hestitates to help those in need or even ofer her home for friends who need a place to go. Although she's the mayor, she helps her sister, Principal Corona, at the magnet school. She's a tough lady and proves it by jumping in the middle of fights to stop students.
She's a typical Borealis Family member in terms of having a sense of superiority over other clans and families. No matter how much of a superiority complex her family members have, it's nothing compared to her daughter, Uno.
Somewhere during the seven year gap between Volume 1 and Volume 2, Halo ends up losting one of her eyes and wears an eye patch over it. She was trying to save someone, but was slashed through the side of her face by a sword and left to die. She, of course, pulled through, but with one less eye. We find out the story of her eye patch in Volume 3.