I’ve only really played around with the dekker character, but you can retarget the animations from the unreal mannequin to the dekker using the same workflow as in my video above,
using humaniod rig retargeting method,
with the free animation starter pack and free miximo retargeted animations… you got 2,000 + animations to play with, without even altering and creating your own.
The only thing to fix is the weapon, it’s part of the main mesh and not separate,
John Galt has an entertaining video on the page 7 for Maya users, the principles the same for any program.
One thing I forgot to mention regarding baking textures, you might have to think about avoiding shadows, but for basic normal map it seem ok,
they use all sorts of packed texutres with different channnels for ID maps and effects, so yeah access to the original texture would be ideal,
baking them out is a rough hack, but good enough for fabric folds etc.