我非金刚何来不坏之身
[wŏ fēi jīn gāng hé lái bù huài zhī shēn]
This nickname, 'How can I have an indestructible body if I'm not as strong as the Diamond (a term often related to something very strong or unyielding in Chinese culture)?', reflects a self-deprecating tone of someone who feels vulnerable and is expressing that they don't have a tough exterior. The user might use this name to imply their inner fragility despite appearing otherwise.