The twin maids, Ram and Rem, are similarly cute on the surface, and pure terror in a fight. Her 'cute talking animal sidekick' Puck looks like an adorable cat, but is terrifying in combat. Silver-haired Emilia is more than a ditzy princess. Many of them reveal themselves to be more than what one might assume about them based on their anime tropes and archetypes.
His life crosses paths with several side characters. You could see similarities between his curse and Homura's plight as revealed at the end of Puella Magi Madoka Magica. It's kind of like precognition but delivered in a nightmarish way. Subaru has to figure out, each time, what actions he has to take to avoid dying. Imagine the stress it would cause someone! Imagine if you got shot in 5th grade and woke up in a classroom in 3rd grade, having to redo the last two years of your life.
