帅气逗比自恋萌比
[shuài qì dòu bĭ zì liàn méng bĭ]
This username combines multiple attributes that the person is trying to convey. 'Handsome' implies they see themselves as good-looking, 'Doubi' means funny or quirky (a term for someone who’s amusingly eccentric), 'self-conceited' means confident to the point of being conceited, and 'cute fool' refers to an endearing silliness.