The harem label gets thrown around way too easily with 'Re:Zero' I think. Sure, you've got Emilia, Rem, Ram, Beatrice, and a few others who orbit Subaru at various points, but the core dynamic is brutally different from your typical wish-fulfillment setup. Subaru's relationships are defined by trauma, failure, and atonement, not by smooth progression toward romance.
I mean, look at Rem. Her confession is arguably a peak harem moment in structure, but Subaru turns her down because his heart belongs to Emilia. That single choice dismantles the whole harem fantasy. The show constantly punishes him for trying to play hero and collect allies like trading cards. The connection feels earned through shared suffering, not just because he's the protagonist.
So no, it's not a harem in the functional sense. It has the aesthetic trappings, but the narrative guts them. It's more a deconstruction of the isekai protagonist's social circle, where every bond comes with a mountain of psychological baggage and physical pain.