Koakuma said: Abyuse shounen? DO FUCKING WANT Also looking forward to yukkuri Kamina and human-Viral.
In all seriousness i think it would be the other way around, a Human Kamina (again) and a Yukkuri Viral.
The Yukkuri Viral will probably work for the creator of the Yu's and at some point made inmortal but still as weak as a yu, only for the creator to make a speech on which he says that yukkuris were never better than humans to begin with and that he only created them to teach humans a lesson through an artificial race shaped to represent everything wrong in humanity.
And that would be the plot twist of the story, yukkuris aren't neither cute critters, poor victims, viles villains, shithead invaders, etc. Only a bouncing aesop of what not to be as a species, made by some crazy wizard! And yeah the human main characters would GASP! at the revelation.
Of course after that yukkuris would be able to do massive heel face turns (sadly not all of them would, but a great deal would.) and everything would be fine for the second season that would be all about Fighting the 2 "Antis" tribes.