In a move somewhat pre-empted by her using it in all of the promotional material, Lucasfilm have announced that as of The Last Jedi, the lightsaber formerly owned by Skywalkers Anakin and Luke officially belongs to Rey.  While I had assumed that this was the case as of The Force Awakens – Luke has the lightsaber he built himself, after all – I did start to wonder what this actually means. You see, since watching The Force Awakens and seeing that lightsaber I had been thinking about how it functioned as an entangled object. The term ‘entangled object’ originated with the “material culture turn” in anthropology around the turn of the millennium, but I know the term through its use by James Whitley as a concept in relating ideas in the Homeric epics to the archaeology of Early Iron Age Greece – that is, the way in which objects drive the plot through their entangled relationships with characters.  Whitley illustrates his argument with an example from a different epic, J.R.R. Tolkien’s The Lord of the Rings:
“Artefacts can exert a malignant force, as in J.R.R. Tolkien’s The Lord of the Rings […] It is the Ring itself (the object that links this tale with all the earlier tales, including the Hobbit [sic]) that, in many ways, drives the narrative, and has greater agency than many of the human (or hobbit, elven or dwarvish) characters.” 
How, then, does this lightsaber function as an entangled object? It exerts a Force (pun absolutely intended) in that for Rey touching it triggers a vision; it shows agency in choosing Rey over Kylo Ren. To a degree, it binds the three Star Wars film trilogies together (if not each individual film); but in doing so it passes between those we might consider the principal characters or the heroes of the films – Anakin, Luke, and Rey. If we think about the lightsaber itself as a character, we can look at the role it plays in the stories of Anakin and Luke to see what Lucasfilm might intend by announcing that they now consider the lightsaber to be Rey’s.