A character who, for some odd reason, doesn't seem to realize how attractive they are. Despite all the attention their good looks bring them, they will either not notice it or interpret it as anything other than the fact that they're really good-looking.
While an Innocent Fanservice Girl can generate this effect due to a lack of a taboo, these characters are often sufficiently attractive that they can cause traffic accidents even when fully clothed. While cunning characters will usually seek to take advantage of this phenomenon, and innocent or shy characters will be embarrassed by it, on occasion a character won't even understand what's going on. They may even lampshade it by wondering aloud why they are a Weirdness Magnet.
This obliviousness is usually the result of one of the following:
Background: the character is extremely naive or innocent. Or they grew up in a society where beauty wasn’t valued, like a Proud Warrior Race.
Culture: the character is from a society that has different standards of beauty that they don't conform to. For example, an inexperienced shapeshifter who chose their form to blend in may wonder if people are becoming suspicious.
Lack of Intellect: in comedies, these characters are sometimes portrayed as simply being mindbogglingly unintelligent.
Personality: a dorky character, a Cute Clumsy Girl, a Broken Bird, etc., might incorrectly presume their awkwardness hides any beauty they might have. For a Cloudcuckoolander, their own attractiveness might be just one of many things they find confusing. Then there are those characters that are too humble to notice or remember how attractive they are to others.
Regardless, a character who fits this trope is portrayed as startlingly attractive in-universe, and yet they seem to be completely unaware that others find them so.
Super-Trope to I Am Not Pretty, where an attractive character thinks they're ugly in an In-Universe example of Informed Deformity. Contrast Proud Beauty and Indifferent Beauty, both of whom are well aware of their beautiful appearances, but one will actively flaunt it while the other simply doesn't care. Inverse of Delusions of Beauty, which is basically about a character who is obliviously ugly.
