I imagine he would have been incredibly handsome (given the vanity) while he was still able to take fair form, before going off to Angband. The archetypal 'bad boi' appeal, or equivalent 'elfy' variation. Seducer, conman, appeals to narcissism to groom. He would have been very creepy at gatherings--flirting or implying such across boundaries of propriety.
Perverse, sexually, as is implied by citations indicationg cross-species couplings. Orcs multiplied quickly. And according to the mode of the children of illuvatar.
After his transition, not sure what was left of objectively handsome.
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