K-2S0 / Kaytoo quotes by Alan Tudyk from the Star Wars: Rogue One movie
The robot serves as part of the Jyn Erso's rogue group that aims to get their hands on the Death Stars 'plan's - the ones used by the Rebels to identify and exploit the weakness found as per the events of A New Hope.
K-2S0 delivers part 'robot awesomeness' and part comedy relief in a similar vein to BB-8 or the two other famous robots that turn up in Star Wars movies.
Alan Tudyk plays the Enforce Droid, K-250 in Rogue One. He's 8 foot tall and is usually addressed as 'Kaytoo'
Tudyk's persona fits this need quite well have demonstrated his comedy bona fides in his roles in Firefly, Transformers: Dark of the Moon, and Death at a Funeral. He's also done a fair bit of prior voice over work, his roles as Mickey in Halo 3: ODST and Zootopia.
The look of K-2S0 is a 'classic' robot look with dark metal, bright eyes suggestive of The Iron Giant. He wouldn't look out of place serving in Jabba's Palace.
The droid was originally an Imperial, and was reprogrammed by his 'mentor' Cassian Andor. Yet something didn’t quite take.“He’s not quite all there,” Tudyk said. “He speaks his mind and says things that could be unsettling. Very honest. If you know any old people, he’s like that.”
The pragmatic droid is an effective insertion agent, as he can blend in perfectly at Imperial installations and outposts.
To Jyn: 'The Captain says you are a friend. I will not killl you.'
Jyn relies 'Thanks!'
To the crew he is flying with 'There is a 97.6 percent chance of failure' - sounds like he's been having out with C3PO a bit much!