In virtual worlds like online games and metaverse platforms, an avatar represents a user in several graphical representations. In this paper, we offer a taxonomy for avatar-based interactions in the metaverse, highlighting scenarios that are relevant for various features of the used avatars. By using avatar types, flexibility, fidelity, and interaction as our chosen criteria, we try to include recent enabling technologies and existing avatar-based interactions in the taxonomy that is being provided. We explore how current metaverse research, platforms, and interaction technologies might be positioned in various circumstances to demonstrate the viability and usefulness of our approach.