Kryten by Robert Llewellyn.

I met Robert Llewellyn last weekend at the Thought Bubble comic convention in Leeds. His main reason for being there was to promote his books, yep, he's a science fiction writer when he's not on TV. He came across as a genuinely nice bloke, and I picked up a copy of the first in his trilogy of books,

It sounded an interesting concept where his trilogy explored the idea of what would happen if something significant in the world we know was the complete opposite.
Free with every copy of his book, but not the reason I bought it honest, was a signed photo of him as Kryten.

Still one of my favourite Sci-Fi characters.
(Note - you should check out Robert's blog... very interesting stuff).

Kryten by Roger Langridge

Kryten is my favourite character in Red Dwarf (no surprise there) and is the one who changes the most as the series progress. Second to Marvin, the paranoid android of Hitchhikers Guide To The Galaxy, Kryten provides a great comedy double act to each of the other characters, but in different ways. Always put upon by Rimmer, largely ignored by the Cat and taken under the wing of Lister, Kryten is your robot without a cause. A robot who is happy to fulfil his programming despite Lister's attempts to get him to rebel and take more control of his existence.
There are some great lines delivered by Kryten throughout the series and his look is how Marvin appeared in my head when I first read Douglas Adams's Hitchikers Guide To The Galaxy. Simple design but effective.
Roger Langridge has been a regular of the UK Comic convention scene for many a year and now enjoys success as writer artist of Snarked! and is always popping up in the Muppets comics. Roger is always happy to produce a great little convention sketch.