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\documentclass[tikz]{standalone}

\def\angle{0}
\def\radius{3}
\def\cyclelist{{"orange","yellow","red","green","cyan"}}

\newcommand\square[1]{%
  \tikz\filldraw[color=#1] (0,0) rectangle (1.5ex,1.5ex);%
}
\newcount\ind \ind=-1
\begin{document}
\begin{tikzpicture}[nodes = {font=\sffamily}]
  \foreach \percent/\name/\color in {
    20/a/orange,
    5/b/yellow,
    10/c/red,
    15/d/cyan,
    50/e/green%
  } {
    \ifx\percent\empty\else                 % If \percent is empty, do nothing
    \global\advance\ind by 1              % Advance list index
    % Draw angle and set labels
    \draw[fill={\color!100},draw={\color}] (0,0) -- (\angle:\radius) arc (\angle:\angle+\percent*3.6:\radius) -- cycle;
    \node at (\angle+0.5*\percent*3.6:0.7*\radius) {\textbf{\percent\,\%}};
    \node[anchor=base west] at (\radius+0.5,0.5-.5*\ind) {\square{\color} \name};
    %\node[pin=\angle+0.5*\percent*3.6:\percent\%] at (\angle+0.5*\percent*3.6:\radius) {};
    \pgfmathparse{\angle+\percent*3.6}    % Advance angle
    \xdef\angle{\pgfmathresult}           %   and store in \angle
    \fi
  };
\end{tikzpicture}
\end{document}

\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{matrix}

\begin{document}
\def\angle{0}
\def\radius{3}
\def\cyclelist{{"orange","blue","red","green","cyan"}}
\newcount\cyclecount \cyclecount=-1
\newcount\ind \ind=-1
\begin{tikzpicture}[
    nodes = {font=\sffamily},
    legend image/.style={fill=#1!50,draw=#1}
]
  \foreach \percent in {
      20,
      15,
      25,
      20,
      20
    } {
      \ifx\percent\empty\else               % If \percent is empty, do nothing
        \global\advance\cyclecount by 1     % Advance cyclecount
        \global\advance\ind by 1            % Advance list index
        \ifnum4<\cyclecount                 % If cyclecount is larger than list
          \global\cyclecount=0              %   reset cyclecount and
          \global\ind=0                     %   reset list index
        \fi
        \pgfmathparse{\cyclelist[\the\ind]} % Get color from cycle list
        \edef\color{\pgfmathresult}         %   and store as \color
        % Draw angle and set labels
        \draw[fill={\color!50},draw={\color}] (0,0) -- (\angle:\radius)
          arc (\angle:\angle+\percent*3.6:\radius) -- cycle;
        \node at (\angle+0.5*\percent*3.6:0.7*\radius) {\percent\,\%};
%        \node[pin=\angle+0.5*\percent*3.6:\name]
%          at (\angle+0.5*\percent*3.6:\radius) {};
        \pgfmathparse{\angle+\percent*3.6}  % Advance angle
        \xdef\angle{\pgfmathresult}         %   and store in \angle
      \fi
    };
    \matrix [
        matrix of nodes,
        draw,
        column 2/.style={nodes={anchor=west}}
    ] at (\radius+1,0) {
        |[legend image=orange]| & a\\
        |[legend image=blue]|   & b\\
        |[legend image=red]|    & c\\
        |[legend image=green]|  & d\\
        |[legend image=cyan]|   & e\\
    };
\end{tikzpicture}
\end{document}

\documentclass[tikz,border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{document}
\def\angle{0}
\def\radius{3}
\def\cyclelist{{"orange","blue","red","green","cyan"}}
\newcount\cyclecount \cyclecount=-1
\newcount\ind \ind=-1
\begin{tikzpicture}[nodes = {font=\sffamily}]
  \foreach \percent/\name in {
      20/a,
      15/b,
      25/c,
      20/d,
      20/e
    } {
      \ifx\percent\empty\else               % If \percent is empty, do nothing
        \global\advance\cyclecount by 1     % Advance cyclecount
        \global\advance\ind by 1            % Advance list index
        \ifnum4<\cyclecount                 % If cyclecount is larger than list
          \global\cyclecount=0              %   reset cyclecount and
          \global\ind=0                     %   reset list index
        \fi
        \pgfmathparse{\cyclelist[\the\ind]} % Get color from cycle list
        \edef\color{\pgfmathresult}         %   and store as \color
        % Draw angle and set labels
        \draw[fill={\color!50},draw={\color}] (0,0) -- (\angle:\radius)
          arc (\angle:\angle+\percent*3.6:\radius) -- cycle;
        \node at (\angle+0.5*\percent*3.6:0.7*\radius) {\percent\,\%};
        \node[pin=\angle+0.5*\percent*3.6:\name]
          at (\angle+0.5*\percent*3.6:\radius) {};
        \pgfmathparse{\angle+\percent*3.6}  % Advance angle
        \xdef\angle{\pgfmathresult}         %   and store in \angle
      \fi
    };
\end{tikzpicture}
\end{document}

%\node[pin=\angle+0.5*\percent*3.6:\name]