The Metaverse is a virtual space on the internet where users can gather, communicate, and enjoy events such as live performances using their avatars. Although the Metaverse has become more common, events often attract only a small number of participants, creating a deserted impression. To address this issue, we propose populating the Metaverse with crowds of virtual characters and allowing event organizers to control their movements. However, controlling a large number of characters in real-time is challenging, as it requires manipulating the parameters of individual characters. To overcome this, we have developed a novel user interface that uses a spatial controller. In our system, the user wears a head-mounted display to view the scene from above and uses a six degrees-of-freedom spatial controller to manage the movements of the crowd. The key idea behind our user interface is that the spatial controller allows users to simultaneously select target characters and manipulate their parameters. Characters are selected by pointing at them with the controller, while parameters—such as the motion magnitude—are adjusted based on the controller’s height. Experimental results show that our interface is both efficient and intuitive for users.