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Vedrfolnir (or give it a different name).
It's the white Twintania-like wyvern that helps you in the MSQ and has a line of dedicated FATEs in The Churning Mists.
It could be bought with 100 Carved Kupo Nut, the Moogles Beast Tribe token but whatever works and isn't way too hard is fine.
It could be ride like Twintania mount but the animations should have slower wings flapping to reflect its personality.
I wouldn't mind a really soft glow of the eyes or reflection at night.
https://i.ytimg.com/vi/exgwTKtok3U/maxresdefault.jpg
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I can see it easily be next tank mount in 4.0 XD