Purple Karjam: A being who has tiny nanobots replacing the atoms of his body. As to what the nanobots are made out of, PK says "smaller atoms".
Witty, I like it!
Never thought about the "smaller atoms" part, maybe that can be canon to PK?
(In case you're wondering, yes, I'm thinking of releasing PK and related mythos on a license similar to Jenny Everywhere. However, I'm also thinking of a "canon" version used as a guideline to creating one's own implementation if they so desired).