biblatex formatting

To manipulate the output of the names you have to set sortname in the correct way.

\DeclareNameAlias{sortname}{last-first}

In this case the first name beside the first author is printed as initial.

To modify this you have to define your own formatting directives via \DeclareNameFormat.

A simple example is given by the definition of last-first (see biblatex.def):

\DeclareNameFormat{last-first}{%
  \iffirstinits
    {\usebibmacro{name:last-first}{#1}{#4}{#5}{#7}}
    {\usebibmacro{name:last-first}{#1}{#3}{#5}{#7}}%
  \usebibmacro{name:andothers}}

The arguments have the following meaning:

% #1 = last name
% #2 = last name (initials)
% #3 = first name
% #4 = first name (initials)
% #5 = name prefix, a.k.a. 'von part'
% #6 = name prefix (initials)
% #7 = name affix, a.k.a. 'junior part'
% #8 = name affix (initials)

In this case you can format the name lists.

If you want to handle the first author in a special way you can use the test

\ifnumequal{\value{listcount}}{1}
  {ONLY FIRST AUHTOR}
  {ALL OTHER AUTHORS}

For example If you want to underline the first author of the list and the name list is formated as last name, first name (initials) you can do:

\usepackage[normalem]{ulem}

\DeclareFieldFormat{FirstAuthor}{\uline{#1}}

\DeclareNameFormat{last-first-underline}{%
    \ifnumequal{\value{listcount}}{1}
      {
       {\printtext[FirstAuthor]{\usebibmacro{name:last-first}{#1}{#4}{#5}{#7}}}
      }%
      {
       {\usebibmacro{name:last-first}{#1}{#4}{#5}{#7}}
      }%
      \usebibmacro{name:andothers}}