Headcanons
Rem has studied martial arts with a focus on judo and karate since childhood which has made her quite agile and well versed in different techniques. The role as Dream Guardian was assigned to Rem during her early teenage years but signs of spirituals gifts showed themself early on.
There is little known of Rem's parents and background. As Rem is fighting off a demonic entity that feeds on teenage hatred and revenge she is shrunk into a small child who's calling for her mother's comfort. Based on this it could be concluded that they havent seen each other in a very long time. I headcanon that Rem's mother used to be a Dream Guardian and for one reason or another decided to be a single parent despite knowing the risks her role could bring to a child's life. A Dream Guardian's life is quite tumultious after all. In order to keep them both safe she travelled to a temple for protective rituals during the pregnancy. During the birth they both were nearly attacked by a demonic entity but were protected by an elderly monk.
As Rem grew up she soon showed signs of spiritual gifta which alarmed her mother. Thus she started to place Rem in extensive training to prepare her for the coming dangers. She made sure to contact her old friend Gepetto who's aided her for years with weapons, cars and gadgets to make sure Rem would be familiar with guns and sword fights as well. Gepetto soon became a grandparent figure in Rem's life while her mother battled demons once again. Her mother was last seen leaving to Tokyo for finding a violent succubus who targeted young monks in training. What happened is still debated but Rem's still searching far and wide after her while also solving paranormal cases.
Print screen from the OVA Drem Hunter Rem. Dream demon at Seibishinjo high school.
