That means it is a perfect example for a character LOD (level-of-detail).
The High-Detailed version of the character is the one with the helmet.
Initial I wanted to have a BGE version of ManCandy as it is GPL and well setup. It is slightly modified to run in the BGE. With all the bones it is really really inefficient. It is not recommended to have more than one of them in the screen. Theoretically it could do facial expressions. But I did not verified that.
The Medium-Detailed version a armature has far less bones. It runes quite fast but lags the animation techniques. interestingly this armature can reuse the actions of the high-detailed armature except for the legs.
The Low-Detailed version uses the same armature as the medium version. Rather than a skin mesh it uses solid objects parented to bones.
Both the medium and low detailed versions are running quite fast. I can imagine there can be versions with much less details (less bones, no armature). That could help to animate a crowd. The speed difference between high and low detailed Characters are quite good visible.
But this was not the point. the point was to give an example to see a complete character setup. As a gimick you can see that you can replace parts of a character.
BTW. The character does not have a complex behavior. It just walks to an object that places itself randomly in the scene on touching.