LaTeX: Roman numbers in enumerate list and adjust space between list items

In the enumerate list, the numbering by default is in Arabic form (1, 2, 3, 4, 5, etc.). You might need to show these numbering in romanized form (i, ii, iii, iv, v, etc.). To do so, you need to use enumitem package. This package pro­vides user con­trol over the lay­out of the three ba­sic list en­vi­ron­ments: enu­mer­ate, item­ize and de­scrip­tion.

In the below example code, I have displayed five different forms of enumerate list:
a) the default enumerate list
b) enumerate the list with roman numerals
c) list with roman numbers and no separation space on top and between items
d) list with roman capital numbers
e) list starting from 5

\documentclass{report}

\usepackage{enumitem}
%\setlist[itemize]{nosep}       % no extra separation
%\setlist[enumerate]{nosep}
%\setlist[itemize]{topsep=0pt}  % no top separation
%\setlist[enumerate]{topsep=0pt}

\begin{document}

\chapter{Introduction}

\paragraph{Enumerate list default}

\begin{enumerate}
\item First item
\item Second item 
\item Third item 
\end{enumerate}

\paragraph{Roman numbers in enumerate list}

\begin{enumerate}[label=\roman*.]
\item First item
\item Second item 
\item Third item 
\end{enumerate}

\paragraph{Roman number, no item separation space, no top separation space}

\begin{enumerate}[label=\roman*., itemsep=0pt, topsep=0pt]
\item First item
\item Second item 
\item Third item 
\end{enumerate}

\paragraph{Roman number in capitals}

\begin{enumerate}[label=\Roman*.]
\item First item
\item Second item 
\item Third item 
\end{enumerate}

\paragraph{Enumerate starting from 5}

\begin{enumerate}[label=\arabic*., start=5]
\item First item
\item Second item 
\item Third item 
\end{enumerate}

\end{document}

Here is the output of the above code:

Hope this helps. Thanks.