okay, I think the "always on top" option is super important, as it's the first thing my daughter asked about so she can record a video tutorial for youtube (using something like obs) and have her avatar in the corner
Though if it's okay to suggest another method in the meantime. If she is using OBS Studio, she can create a new source that only captures the Avatoon window, resize and pan it to where she'd want it placed in the recording. She could add a chroma key filter to it too.