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A descriptor, or anything else being used in place of a proper noun is capitalized as if it were a proper noun, because it essentially is one. You would typically not capitalize the unless it is a...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33810 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
A descriptor, or anything else being used in place of a [proper noun](https://en.wikipedia.org/wiki/Proper_noun) is capitalized as if it were a proper noun, because it essentially is one. You would typically not capitalize _the_ unless it is an intrinsic part of the character's "name," which it might be. > He took a personal meeting with The Donald, which he would later regret. This would be rare, even in the case where people never use the name without the definite article. You would typically reserve it for cases where (for example) "The Sentinel" refers to a specific unique person who needs to be distinguished from a host of other sentinels. > No, he's not just a sentinel. He's "_The_ Sentinel."