他不帅却是我的最爱她不美却无人可代替
[tā bù shuài què shì wŏ de zuì ài tā bù mĕi què wú rén kĕ dài tì]
This nickname conveys that one's love is not about physical appearance. It expresses that the beloved person may not be conventionally attractive, but they are irreplaceable and hold a unique place in the heart.