Fusion With Rei: https://www.deviantart.com/aniahmator/art/Rei-And-Sagittarius-Fusion-739184830

Sagittarius is one of the spirits that help out Rei as the Zodiac Wielder. He is quiet and emotionless, also he was the last zodiac to fuse with Rei. He has a strong bond with Cancer, who is technically his adopted brother. Along with the 12 other zodiacs, he aids Rei in fighting the Reverse Zodiac Wielder and the 13 Reverse Zodiacs.