The process of turning into a Regia also causes a mutation into the patient's gene, while the most common changes are the blue marks on their skins, at times the process also causes other physical changes to the patient. However, it is to be noted that these changes tend to carry to their children and these...abhuman children would then proceed to create new clans of these human. Less than a Regia, but certainly more than Human.

Recorded Physical changes:
-Enlarged size (Jotun)
-Stone skin (Ravalkian)
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well, you get the idea. If you want to play as something not quiet human, but not one of the listed Races.
Do note that if you start as a race native to Gaia, you will not start as a crew member of the ship and therefore, will not start with an Egis.