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I think Alfendi is asexual rather than Ambiguously Gay. There's no implication of attraction toward males, just that he isn't attracted to females. It fits asexuality much better.
I don't recall his sexuality ever being brought up. I don't see any reason to list it at all.
Move to YMMV, maybe? Also, is there even a trope for asexuality? Not that there shouldn't be, I just don't ever recall seeing one.
Oh wow, it does exist! I'm pleasantly surprised.
(But yeah, both tropes might work in the YMMV section)
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How well does it match the trope?