Codsworth

Codsworth is a Mister Handy unit that resides in Sanctuary Hills, and acts as a butler towards the Sole Survivor's family. After the Sole Survivor emerges from Vault 111, Codsworth acts as a potential companion in Fallout 4.

Background
Still functioning after 200+ years, Codsworth is the Sole Survivor's personal household robot from before the Great War. Due to Codsworth's attentiveness, its adoptive family was able to leave soon enough to reach the nearby nuclear fallout shelter in time for the Sole Survivor, at the very least, to gain safe entry to the vault.

Quests

 * War Never Changes: The Sole Survivor interacts with Codsworth before War in their Sanctuary Hills home.
 * Out of Time: Codsworth attempts to aid the Sole Survivor in finding their family after they emerged from Vault 111.

Other interactions

 * Every X amount of time, Codsworth will filter a can of Purified Water, which he will provide automatically when the player talks with him.
 * If Codsworth doesn't have anything relevant to the current situation when asked for his thoughts, he opts to tell a joke instead.

Appearances
Codsworth appears only in Fallout 4.

Behind the scenes

 * When getting hit in combat Codsworth quotes the Black Knight from the motion picture Monty Python and the Holy Grail. As neither feel the pain of being hurt.