FF12 style moogles for next playable race.
The first thing I want to ask of you before you read any further is to let go of any prejudice against moogles that may carry over from your time spent in The Churning Mists. If you can get past that, maybe you'll like the idea.
I've wanted to have a playable moogle since FF6. Mog was cool but the moogle design from 6, 9, 14, and other similar designs wouldn't work too well for a playable race with armor and such. My suggestion is have the design from FF12. Here's a picture of moogles from FF12:
https://vignette2.wikia.nocookie.net...20070325003033
Designing armor and weapons for these moogles would be the exact same as lalafells. I also believe the game needs another short race just to have more balanced options.
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