@junebug the Ar Tonelico series. Fascinating, well-fleshed out stories and setting with a fantastic amount of background detail, including its own model of physics, and the dive system theoretically could be used to explore various motivations and mentalities in its world and characters in a mature and candid light, BUT
The games themselves have a problem with uncomfortable and skeezy fanservice that starts out as obviously disconnected "marketing decisions" that can be ignored, but gets more deeply entrenched and problematic in the series as it goes on, and the community has a problem with people who will go out of their way to find posts like these on hellsite and defend it to their last breath
These days I mostly focus on the teru tribe, which have a deeply interesting history of their own throughout the setting and are one of the few things that aren't associated with any of the really unpleasant decisions made by the developers... mostly because they're only really used as plot devices orz