personally, I’m not the biggest fan of modern aus (the more distance from real life the better lmao), but in particular the significant traumas of the characters don’t always translate well (which… maybe the point actually). But seeing how the author does is always interesting! that said, here’s how the closest I can think of for a dgm modern au:
Allen: if you cut out the whole past self and possession situation, up until the Order, it’s pretty one to one. As a child, he had a limb difference and was trafficked. He met Mana and Allen the dog, the dog died, the place he was trafficked to burns(? maybe attacked and he was spared out of pity?) Due to the trauma of the incident, Mana gets worse, thinks Allen is Allen the dog and then they live on the streets until Mana’s death. Occasionally Mana mistakes him for Nea to keep that aspect of the trauma. Allen is attacked shortly after, survives, and is eventually taken in by Cross (and his debts). He gets a few stalkers or already has them and finds out later.
Lenalee: once again, the fighting is a bit tricky for a plain old modern au, but I can make some things work! After her parents died in an attack, she was adopted out of China into England to an abusive family. Eventually Komui was able to get custody of her… I’m unsure/doubtful he would actually be able to do this with the systems in place, so maybe foster care would work better?
Kanda: A cult??? I guess? And Alma died setting a fire maybe? Unless you want unethical government experiments in your modern au!
Lavi: … I don’t know about this one. A very emotionally distant family that shamed any expression of emotion or connection as weakness? But it doesn’t have quite the same implications, I think.
Miranda: Pretty easy! She’s still miserable and can’t keep a job. Poor Miranda.
Alistar: A bigoted, isolated small town? Very tough on this one. Maybe such a small town that superstition still runs strong and he was run out of town during a series of disappearances (actually caused by his girlfriend, Eliade).
Timothy: Pretty much the same. Abusive father who was eventually jailed for thieving, the orphanage where he lived had money trouble and he started stealing himself. Not sure where the trauma from the orphanage being attacked could fit in.
Mana: A crime family/mafia?? His brother (for reasons we aren’t sure of yet) went on a rampage and managed to take out most of the family, forcing Mana to kill him.
Link: he and his siblings/friends from the streets are adopted by a corrupt government official.