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#8, Zohar
The Zohar is a common element throughout the Xeno series and Pyra and Mythra's alts take from the Xenosaga Zohar. Pyra shares a palette with the Original Zohar with the gold and light-green. Mythra takes from T. Matsuda's Zohar Replica seen in the opening of XS1.
#7, Monado
This alt is a bit of a dud. Pyra can definitely be argued to take from the Monado especially with the canon connection, but Mythra is an outlier that fits no reference to a satisfying extent. She can possibly share the palette, but really there's nothing there.
#6, Xenogears and Deus
Also not a stated reference, but here Pyra and Mythra heavily share color schemes with Xenogears (Gear) and Deus (who have the same palette already).
I mean come on I don't really have to explain the connection between Pyra and Mythra and the Zohar right like the Dammerung/Wilhelm/Albedo connected to the Zohar and it was a reach but like this is legit.