
It depends on what you want to do.
When I was planning how my main character's backstory, I considered making her some sort of vigilante, wearing one of those creepy gridanian wooden masks whenever she wanted to burn someone to a crisp. How I was going to play it was making a 'civilian' version of the character that would use the real name, while having an alt that looked exactly except for the fact that she would wear her hair differently (but taking care of picking styles with the same 'volume') and the mask all the time. The name of this alt was going to be "Masked Madness".
That would have worked because the 'secret alt' would never show its face normally, so people might look on the similarities of both characters and draw conclusions without breaking immersion.
I assume Isobeau Mauvaix is the real name of your character and the one you want to use on the 'masked' version. In that, case, using an Adjectived Noun (like, say, Travelling Duskwight) on the unmasked version would probably work for meetings in the street, as people will think both characters look alike but dismiss Travelling Duskwight as an NPC.
The problem comes the moment other characters discover that they are the same person. Then the name 'Travelling Duskwight' suddenly is very, very innacurate.
It depends on what you want to prioritize, at the end: IC knowledge, in which case it is better to use a personal nickname for one of the two identities; or OOC knowledge, where you'll want to use Adjectived Noun instead to keep the mystery as long as possible.
When I was planning how my main character's backstory, I considered making her some sort of vigilante, wearing one of those creepy gridanian wooden masks whenever she wanted to burn someone to a crisp. How I was going to play it was making a 'civilian' version of the character that would use the real name, while having an alt that looked exactly except for the fact that she would wear her hair differently (but taking care of picking styles with the same 'volume') and the mask all the time. The name of this alt was going to be "Masked Madness".
That would have worked because the 'secret alt' would never show its face normally, so people might look on the similarities of both characters and draw conclusions without breaking immersion.
I assume Isobeau Mauvaix is the real name of your character and the one you want to use on the 'masked' version. In that, case, using an Adjectived Noun (like, say, Travelling Duskwight) on the unmasked version would probably work for meetings in the street, as people will think both characters look alike but dismiss Travelling Duskwight as an NPC.
The problem comes the moment other characters discover that they are the same person. Then the name 'Travelling Duskwight' suddenly is very, very innacurate.
It depends on what you want to prioritize, at the end: IC knowledge, in which case it is better to use a personal nickname for one of the two identities; or OOC knowledge, where you'll want to use Adjectived Noun instead to keep the mystery as long as possible.