我的帅比光芒万丈我的萌比闪闪发亮
[wŏ de shuài bĭ guāng máng wàn zhàng wŏ de méng bĭ shăn shăn fā liàng]
In this creative username, the person declares they are so stylish ('stylish beyond brilliant') and charmingly adorable ('adorably sparkling'), playing on exaggerated praise for their charm and looks in an almost superhero fashion.