An only somewhat Nihilistic Wizard got drinking one day and seethed as he saw so many people just using their Humanity in the most wasteful ways. An Animal could easily be destructive, so could electrons in the air, and often some of the worst people were less useful than a chair at times. So the Wizard wondered what if the person and chair could swap places. So he created a device that somewhat looked like a spray gun that you could attach jars to. The device would then sense your intentions and do one of three things depending on which button you pressed.
The first is sucking up the humanity of a person you targeted, what they'd turn into depends on the person's intentions and knowledge. Animals and plants tend to be somewhat easy, but inanimate objects are a little more tricky. Something simple like a chair made completely out of stone is easy to understand, something more complicated like a computer... You'd need to picture and understand each component to the smallest level. However for the difficulty comes the benefit that more than humanity get sucked away when turning inanimate. Aspects such as gender and the like that also apply to animals also get sucked when turning someone inanimate.
The second option is blowing the humanity into something. There is an enchantment so that if the button is accidentally pressed without an appropriate target in mind the humanity just wont get blown into the Ether, the wizard did want to make better use of humanity after all... Just be careful when changing jars... Other than that you take the humanity and/or aspects absorbed and infuse something inhuman making them more or completely human.
The third option is swapping traits in the jar with another target. Say you turn someone of the opposite sex into a stone chair, you could then use the third option on yourself to have the Humanity Drainer both suck away your sex and infuse you with the opposite sex.
At the end of the creation session when the Wizard sobered up they looked at the device and chucked it... somewhere... Landfill, holding chest, etc... they didn't really care anymore as they leaned in an uncomfortable stone chair.