Karen is admired by other students due to her calm and stoic nature. This, however, is her outer character—she is actually very lonely, especially when thinking about her parents, whom she secretly misses. Because she has known Komachi for such a long time, Karen often feels responsible for being there for her; to an extent, she feels this way about everyone, believing it to be a natural responsibility of the president of the student council. Because of her position, Karen is able to memorize all the names and faces of all the Cinq Lumières students, and also easily takes responsibility when something happens to the school, as seen in the second episode where she wants Nozomi to explain what happened to the library the other day.