"Haha!"
Raleerus.
Perhaps as a clone that was left on his own for almost an entire year without any outside influence from Riley, interacting and trying to live amongst the aliens, he had a personality that was completely different and independent compared to the rest of Riley's recent and latest clones.
And since he had met hundreds of different species and learned some of their languages, he had also gained an understanding of their different cultures— one could even say that Raleerus was more… cultured than his creator, and even John.
When Riley left him, he didn't really have any sense of purpose or mission. The only thing he had was an urge to kill everything that talks; and so, with him finally being allowed to kill and wreak havoc, murder and destroy he did.
