Neodoll is Lucidtoys, you can find them on their own website.
With oiling it really depends on the blend of TPE. Some of the older girls needed oiling a lot more often then say that of the more modern WM girls. Powdering is only really needed when their skin feels tacky to touch.
I am not sure if they will like skydiving, as I heard, "If at first you don't succeed, sky diving isn't for you."