I don't know Cinema 4D, so I don't know if it'll work or not.miharu0607
all your screenshots show the importers work terribly bad...
In all cases, to export your models, you should use the exporter I published, as it's doing automatically the needed re-orientation of the model (some other exporters may have this as an option though).
PlayerMale01L = low poly version of PlayerMale01 .
For now, either : turn off the shadow, or copy/paste the exact same model to the Low poly version (I guess it's what I did for some of the hats). If you're super-motivated, you could lower your model's poly later on, once you have the final version of your high poly version...