萌浅呆深
[méng qiăn dāi shēn]
This username conveys the contrast of being 'cute but slightly foolish on the surface' while 'holding deep, sincere emotions inwardly'. The character ‘浅’ means superficial and ‘呆’ suggests a bit of foolishness or innocence, contrasting with the depth suggested by '深', which can also imply profound affection.