How do I understand Ni (you) character correctly?
Outlier


  FORM
  你 consists of 尔 (a shorthand form of 爾 “you”), and 亻 (person), indicating the original meaning “you.” 尔 also gives the sound.
  [Reference, p. 1253]
  
  COMPONENTS
   亻
  In 你, 亻“person” is a meaning component, indicating “having to do with people.”
   尔
  In 你 nǐ, 尔 ěr is both a meaning component and a sound component. It is shorthand for 爾, an ancient character that meant “you” (among other things). The sound connection between 你 nǐ and 尔 ěr is not obvious in modern Mandarin.