你是我的BabyGirl我是你的SuperMan
[nĭ shì wŏ de babygirl wŏ shì nĭ de superman]
This nickname conveys a romantic and somewhat whimsical expression. It implies that the person is someone special or cherished like a 'baby girl,' while also portraying themselves as the protective figure of a superhero, expressing an adoration and deep affection towards each other.