The creators of this anime tried to keep the characters as true to life as possible while maintaining this kind of supernatural setting. You see that realism in the dynamics between them at the office (some character are older than others, for example) and in their histories as they're revealed. I thought that the characters could have been explored further, however. We're really only offered a superficial view of the characters. There aren't many soul-searching monologues in this series as you may see in others. There is not a lot of dialogue at all, in fact. More often, you'll see pointed glances or pregnant silences underscored with muted, suspense-building music. Subtlety is key in this anime, but in the end, we don't know the characters in this show very well, and we're not very attached to them, unfortunately.
In each episode you learn a little bit more about Robin, the other witch hunters, and the agency where they work. Apparently, though all of the hunters besides Robin have worked for the agency for some time, they do not know much about the true purposes of their company and as their work continues, moral questions arise. Ultimately, this is the major question of the series: are witches evil and what is the purpose of the witch hunters? You'll find that not all of your questions are answered by the end of the series, but this dangling ending seems intentional on the part of the creators of this show. They leave the possibilities open.
At the same time, Robin struggles with her identity as a "craft user" herself and the seemingly cool and professional Amon has to choose his loyalties. These were interesting aspects of the drama, but you have to be patient with this anime. The pacing is slow. Action is infrequent. You learn in bits and pieces about the organization and the world of witches in which Robin moves-- just as Robin, herself something of a newb, does. In fact, at one point in the series, there is very little action at all and it is almost slice of life, albeit a gloomy slice. It's interesting to watch as her relationship and trust with Amon slowly progresses, though this anime never approaches anything verging on romance (pity). The music, meanwhile, is is atmospheric and accomplishes its goal of intensifying the action, well-suited to a mystery thriller.
While not exactly fast-paced, if you appreciate a story that gradually unravels with darker, subtle artwork, you may like this show. It's worth watching just to experience the unique mood that Witch Hunter Robin builds through skillful scripting, art, and pacing. It truly defines mystery.
