Clank is a robot. He is a character in The Ratchet and Clank series of games. This charming little robot was built accidentally, in a factory for Sentrybots (who later play a part in the first game). He was also considered to be one of the only robots in the Galaxy with a soul.
Apart from The Ratchet and Clank series, he seemed to enjoy making little appearences here and there in other games, such as The Sly Cooper Series In the fourth game, when he was pictured as a "Medival metal man" collectable statue. He also appeared in another series created and developed by Insomniac Games titled "Resistance: Fall of Man" as a collectable backpack in the multiplayer mode of the game.