I use Rigify, Mixamo and Unreal Engine together on a regular basis. They are great tools and incredibly powerful when used in a mix, so I have decided to make an add-on out of my character utils and release it for everyone to use.
You can see it in action in my video series below.
Blender is my software of choice when it comes to Game Characters: there are a few limits but they are easily overcome, and a lot of benefits in terms of speed and effectiveness.
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This is brilliant. Thanks for sharing your work!