Yukari Tokisaka

An old-fashioned, reliable type of girl. Takes care of her older brother, who happens to be helpless when it comes down to household chores. Stops by Reiji's office periodically to help him clean it up. An academic like her brother, but with interests rooted in entomology. Keeps various insects inside her room. Don't let your guard down around her, as some of her insect friends may turn up on the dinner table when you least expect it.

(Source: vndb.org)