Я сам нашел как заспавнить персонажа со шкалой, вот код если кому надо.
def assetspawn(translatex, translatey, translatez, rotatex, rotatey, rotatez, scalex, scaley, scalez):
AssetPath = '/Game/GameMiddles/Base/SM_Base_B_OUT'
actor = unreal.load_asset(AssetPath)
actor_translate = unreal.Vector(translatex, translatey, translatez)
actor_rotate = unreal.Rotator(rotatex, rotatey, rotatez)
actor_scale = unreal.Vector(scalex, scaley, scalez)
actor_before_scale = unreal.EditorLevelLibrary.spawn_actor_from_object(actor, actor_translate, actor_rotate)
actor_before_scale.set_actor_scale3d(actor_scale)