Display name fixed number of character remaining fill with specific character

     In the following example, I want to fill the name exactly 20 characters, if the character count is exceed 20 character remove remaining character and if the character is lesser than 20 character fill with blank space(left aligned).

Example

  SELECT convert(nvarchar(20),LEFT(CONVERT(NVARCHAR, 'Merbin Joe') + SPACE(20), 20)) Name

This will produce

 Merbin Joe

But you can't able to see the blank space's so you should need to identify the space using [] or other way.

SELECT quotename(convert(nvarchar(20),LEFT(CONVERT(NVARCHAR, 'Merbin Joe') + SPACE(20), 20))) Name