Introduced two years ago in Rogue One: A Star Wars Story, K-2SO was an Imperial droid reprogramed by Captain Andor to serve the Rebel Alliance. The process caused K-2SO to develop a cynical and sarcastic personality, adding comedic relief during dramatic scenes.
In the end, K-2SO sacrificed himself, so it’s (sadly) unlikely to ever see him in a film with the other droids, BB-8, R2-D2 or C-3PO, but that doesn’t mean that you couldn’t add him to that droid tattoo you’ve been thinking about.
K-2SO has won him a number of fans in the tattoo community. If you, too, share a love of this droid then these tattoos will serve you well as inspiration.