So I really wanted to try Cascadeur, but it's Windows only for now. I looked in to installing Windows on my Mac, but just don't have the stomach for all the bother at the moment.
This reminded me of a Mac 3D app that I hadn't looked at in a couple of years.
https://www.cheetah3d.com/
It's $100 to purchase, and has a free unlimited time trial that offers all features except saving projects.
Here are some YouTube tutorials which discuss animation in this software.
https://www.youtube.com/playlist?list=PLFQBXHoRDfRjLiNNUYL-gRmveUOHmHbVJ
It will export in DAE, FBX and some other formats. So you should be able to pose a character in Cheetah and bring it in to SketchUp. To add an animated character to a SketchUp scene I guess you'd have to use the video editor method.
So if you wanted to create your own character animations, and not have to rely on Mixamo stock animations, and are on a Mac, Cheetah might be helpful.
To the best of my understanding, Cheetah is similar to Blender, but is more accessible to novices. Sounds right for me, so I'm going to dive in to it.
I know that Dave is hoping to animate directly in SketchUp, so this is kind of off topic, but hopefully helpful to somebody.