I created a bunch of yukkuri based on key characters in order to use them in a story that I haven't finished yet, but before I post that one, here is Chapter 1 of a story that I just came up with tonight.
When Daleks Discovered Yukkuri
During the long forgotten Dalek invasion of 2010, The Daleks discovered the strange creatures known as Yukkuri. At first, the Daleks treated yukkuri much the same as they treated any other form of life, exterminate them and be done with it and then get back to whatever else they were doing.
But, eventually the Daleks discovered something about Yukkuri and, more importantly about themselves. They realized that exterminating Yukkuri, especially the loudest and most annoying shitheads, brought the Daleks something that was supposed to have been bred out of their DNA since their creation, actual PLEASURE!
Yes, the Daleks actually ENJOYED listening to yukkuri scream and beg for their miserable lives while they were being shot. and so, the Daleks instead of killing yukkuri as quickly as possible, experimented with newer, better, SLOWER ways to kill yukkuri, such as hitting them with sticks, running them over, shooting them with (GASP) non lethal weaponry until they died of their injuries, starving them, letting Ogrons "play" with them, stabbing the,. feeding them poison, injecting them with water until they were dear death, injecting with orange juice and repeating the process until the yukkuri were driven insane with pain and leaving them to scream and cry themselves to death, scaring them until they threw up their fillings, letting animals rip them apart, letting starving humans rip them apart, ripping them apart with small, microscopic scalpels that slowly cut them open atom by atom and listening to them scream and cry, first for mercy and then finally for a quick death, healing them and repeating the "fun" all over again for days on end and even letting them gorge on food and then keeping them in their own excrement until they slowly developed mold over most of their bodies, cutting the mold away, soaking them in orange juice to keep them alive and repeating the process until they went completely catatonic and only then, feeding them to other yukkuri, who then could no longer take it easy ever again. they even took hundreds of yukkuri, took the accessories
from half of them and made them fight the other half to get THEIR accessories or die trying. This "sporting event" was broadcast through the galaxy for two reasons. One, to make races that knew nothing about humanity fear the Daleks and second, to distract other races so that the Daleks could sneak in and attack them while they were son engrossed in the yukkuri fights.
But, eventually, the daleks were defeated by the Doctor and left Earth. but they did not leave alone. They too with them over 2000 yukkuri to be used to breed millions of yukkuri, all to be used for everything from simple torture to Ogoron chow, to experimentation to weapon research.