It was his little sister Rene! She'd been 12 at least, but now she looked about 5! She had light purple skin, dark purple hair in ponytails, pointy ears (all imps have pointy ears), a pair of cute horns protruding from her forehead, black eyes with golden irises and slit pupils, a pair of small bat-like wings, a spade-tipped tail, and fingers and toes ending in sharp claws!
Nelson quietly watched his little sister-turned-imp carefully, but she seemed more interested in stuffing her face with candy and other junk-food than finding someone to convert!
"Some things never change!" he thought to himself. He noticed she was wearing a black leotard, a black spiked collar around her neck. This seemed to be common among imps, as he noticed clothing was also affected!
Rene was busy scarfing down her 3rd bag of candy corn, when she collapsed on the floor. "Sugar crash, no doubt!" he thought to himself, as he quietly came up to her.
Even in her unconscientious state, she still had a wicked grin plastered onto her imp face, like she had no regrets about how much sugar she'd just consumed! This caused Nelson to almost laugh at the sight, but chose not to because 1: it would be inappropriate under these circumstances, and 2: he didn't want to risk other imps hearing him with their pointy ears!
He couldn't help but feel bad for Rene - even as an imp, she was still his sister.
Against his better judgement, Nelson picked up his imp sister, and carried her over his shoulder.
"If I'm lucky," he thought "she'll stay asleep long enough so I can get out of the city, find a doctor, and maybe see about curing her!"
As he ran along the abandoned streets, he failed to notice Rene slowly open her eyes! She looked down, and realized her big brother was carrying her, but she liked being carried, so she fiendishly chose to let him think he's winning, and wait to ask him to play when the time was right!