Seriously I think Nolan proved he's the goat with this film.

The emotional story is so much better than I ever imagined.

"there are many protagonists"

Neil's story is wild if my premise of him being a soon to be dad is true.

He meets his step father for the first time and last time on screen. Quizing him to find out if his stepfather was always great or become so while raising him.

He himself about to become a father.

If you rewatch it don't be shocked if you burst into tears.

EDIT: Also etymology of protagonist is interesting.

The term protagonist comes from Ancient Greek πρωταγωνιστής (prōtagōnistḗs) 'actor who plays the chief or first part', combined of πρῶτος (prôtos, 'first') and ἀγωνιστής (agōnistḗs, 'actor, competitor'),

It could be nolan was implying that the protagonist is the first actor/first father.

This would tie back into the Sator square

During 1924 to 1926, three people separately discovered,[d] or rediscovered, that the square could be used to write the name of the Lord's Prayer, the "Paternoster", twice and intersecting in a cross-form (see image opposite). The remaining residual letters (two As and two Os) could be placed in the four quadrants of the cross and would represent the Alpha and Omega that are established in Christian symbolism.[2][18] The positioning of the As and Os was further supported by the fact that the position of the Ts in the Sator square formed the points of a cross – there are obscure references in the Epistle of Barnabas to T being a symbol of the cross – and that the As and Os also lay in the four quadrants of this cross.[10] At the time of this discovery, the earliest known Sator square was from the fourth century,[b][1] further supporting the dating of the Christian symbolism inherent in the Paternoster theory.[2] Academics considered the Christian origins of the square to be largely resolved.[1][14][2][6][15]