I am going to start your project right now. As a skilled Unity3D developer with experience in C# programming, game development, and mobile app development, I'm confident in my ability to tackle the tasks you've laid out for your Metaverse project. Your need for an optimal avatar creation experience, seamless API data integration showcasing videos and PDFs, bug fixes with the third-person controller are all areas of expertise.
I'm well-versed with saving user data locally or on servers, which is exactly what you require for saving avatars to appear later. Additionally, I have a robust understanding of APIs and can effectively integrate Vimeo/Youtube/VideoFile content into your project, providing a smooth user experience in your classroom environments.
Furthermore, my eye for detail addresses your concern about fixing bugs related to the overpowered jumping by preventing avatars from reaching inaccessible locations and rectifying any faulty camera angles. Finally, the media library task stands out as an area where my skills in organizing and categorizing content via API read would come in handy.