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Mori/Gura works for a bunch of reasons.
-Mori likes cute things, Gura is goddam adorable
-Gura appreciates Mori's talent
-There may have been a time where Mori spared Gura at the fall of Atlantis (aided through the moves of others, though they didn't know it)
-They can be huge dorks and be comfortable around each other
-The primal predator part of Gura recognizes Mori is the best hunter in the world
Not knocking any other Myth pairing because you can find good reasons to make any of them work. It's so many good pieces of art and stories.