The following is the location setting of my all my works, and if you read some them closely, you will notice the reference between each of them:

Books set on earth:

Game of royals (MC):

Ling

Charlotte

Yumi

Silk

Demon's redemption (MC):

Sol

Iu

Iris

Claw and heart (MC):

Angeline

June

City of fog (MC):

Ying

Mi

Yoshino

Aurora

Aine

This game called life (MC):

Riga

Enju

Rima

Constanze

Iron Angel universe:

Iron angel series (MC):

Kardusenn

Rin

Isa

Kuro

Veritas

I been teleported into a world determined by power level* (MC):

Gid

Lili

Petunia

Hazuki

*It's in it's own universe