The Last Word

Who has the last word in a work of fiction and especially in the concluding installment of a series? It could be:

the omniscient narrator;
a third person pov;
a first person pov;
a closing remark by one of the characters.

Poul Anderson's trader team series ends with "Lodestar." Mirkheim is a sequel in which the old team is reassembled later for a different purpose. "Lodestar" ends when Nicholas van Rijn's granddaughter sees that he is "...indeed old." (David Falkayn: Star Trader, p. 680) Mirkheim ends when "...eastern clouds turned red." (Rise Of The Terran Empire, p. 291) - a morning, a new beginning, but with sunset colors symbolizing the beginning of the end of the Polesotechnic League.

Dominic Flandry's testament, on the last page of The Game Of Empire, is his short speech about "'...the game of empire, of life, whatever you want to call it...'" (Flandry's Legacy, p. 453) but then he settles some practical matters and the novel ends with Axor's smile, reflecting Kipling.

Manse Everard cursorily ends the Time Patrol series:

"'Let's go,' Everard said, and led them away." (Time Patrol, p. 765)

The TV adaptation of Agatha Christie's Curtain: Poirot's Last Case ends with Poirot's last words about good days but I find to my surprise that the novel follows the "End of Hercule Poirot's manuscript" with a "Final note by Captain Arthur Hastings," referring to "...the brand of Cain..." (p. 188)

These are all appropriate endings but it made sense for the TV version to end with Poirot's words and now I quote Puck:

ROBIN

 If we shadows have offended,

 Think but this, and all is mended—

 That you have but slumbered here

 While these visions did appear.

 And this weak and idle theme,

 No more yielding but a dream,

 Gentles, do not reprehend.

 If you pardon, we will mend.

 And, as I am an honest Puck,

 If we have unearnèd luck

 Now to ’scape the serpent’s tongue,

 We will make amends ere long.

 Else the Puck a liar call.

 So good night unto you all.

 Give me your hands if we be friends,

 And Robin shall restore amends.

-see here.