That's because Halbrand is a show invention.
In reality, Sauron took on the guise of Annatar, an elf who was revered by the other elves as very fair and beautiful. This worked because Sauron is a Maiar and the elves are the one race that were allowed to live in Valinor, the land of the Maiar and Valar. With this form, Annatar enthralled the elves and got close with Celebrimbor, eventually convincing him to forge the Rings.
I'm still hoping Annatar appears in the future simply because he's stylish and beautiful:
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