A post I made in another thread:

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something i really liked, i think it's open for interpretation:
fenrir, or the wolf appearances
a wolf kinda symbolises a strong sense of independance and leadership, but often you see a wolf running with a PACK

Cloud kinda reminded me of a leading/independant "wolf" who didn't have his pack in the beginning of the movie (or during the 2 years)
but as the gang gradually rejoined, it made him "cloud" again, the one who leads the pack on