Binkan

Binkan is just an innocent bystander who is often nearby whenever SOX performs another act of ero-terrorism, staring at their latest handiwork. She is hardly acknowledged by the main characters until the final episode where it is shown that she is a prefect in training under the leadership of Oboro. Binkan's real name is never mentioned; her nickname roughly translates to "little sensitive (girl)."

(Source: Wikipedia)