Plo Koon's astro droid that appeared in "Shadow of Malevolence" and "R2 Come Home" is called R7-F5.
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R2-A3 is a red astromech droid used by Wedge Antilles.
Kel Dor (see more info at the related link below)
If you go to the Star Wars encyclopedia website, Wookieepedia, and go to Plo Koon's page, scroll down to the article about Plo's early life and you will see a photo of what he looks like without his mask. If you have trouble finding it, then go to the related link
His age has never been released
Plo Koon's species, the Kel Dors, are completely adapted to their home planet, Dorin, that they cannot breathe or see in other atmospheres without special equipment.