A minion of the Rooftop Witch.
It's role is to lock.
It frets and worries about whether the daydreaming witch is going to jump off the rooftop. Whether it is locking the school doors, moving about sweeping the floors or pointing and calling, it's completely devoted to the task. It is in charge of the keys to the rooftop where the witch is but it frequently looses them due to its own carelessness. Therefore its fellow minions hold duplicate keys but, if any one of them falls over the state of security on the way to the rooftop would.. how careless.
It finds any intruders to this completely closed-off barrier detestable. If any are found, all surrounding minions would quickly gather and attack while dynamically waving around their very important key.