Action Generators
A site like Mixamo can help you create specific actions for their (or your) characters. The site is pretty intuitive but you will need to sign up/log in with your Google account. When you want to download a specific character/action, use the .fbx format. It's usually a good idea to download several different actions to string together in Blender as well as the generic T-pose of the character. It's best to download all the actions for a particular character into a single, separate folder.
Note that you can also upload a character that you create in Blender, have it auto rigged in Mixamo and then apply one of the site's actions to it.
Note that you can also upload a character that you create in Blender, have it auto rigged in Mixamo and then apply one of the site's actions to it.