This is Fantasy Cyber Assassins Character . There's no additional bone. don't need to Retargeting Animation.
Worked with UE5 Skeleton.
Features:
Rigged with Manny Epic Skeleton
Rigged: (Yes)
Rigged to Epic skeleton: (Yes)
If rigged to the Epic skeleton, IK bones are included: (Yes)
Animated: (No)
Vertex counts of Characters : 22,864 Tris (With Mask)
Number of Materials and Material Instances: 12
Number of Textures: 28
Texture Resolutions: 2048x2048