"The trope is indeed as you say, but the quoted logic doesn't work. We don't name tropes after common ways the play out, we name them after the trope. "
I've seen countless examples over the years here that do exactly this. The only one i can name of the top of my head is Variant Chess
, (incidentally i started a threa for that trope a while back on the premise it was bad for the reason you just stated, and got told it wasn't an issue), though i know i've seen otehr examples at various times.
"Oh no, not this again. Don't tell me we're going to rename this Significant White Haired Character.
Yes, when you give a character a noticeable, distinguishing characteristic, you mark them as significant. That doesn't make each of these characteristics its own trope. White Hair Means Magic could totally be a trope. White Hair Means Something Anything is not a trope. "
Do we need or indeed should there be a seperate trope though for every instance of white hair means X. Thjats multipule tropes your talking about creating and then doing a split from this originol on. It's also somthing i've again seen in the past around here, virtually every trope that is about a special attributte, (apperance or otherwise), boils down to "they hve X attirbutte, this marks them as special".