How to change the distance from the top margin and chapter title?

Question

How decrease the distance from the top margin and chapter title only of the title page, keeping the margins of the following pages unchanged. Also, how to narrow the distance between the title of the section and the title of the chapter?

\documentclass[12pt]{report}
\usepackage[brazil]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lipsum}
\usepackage[Glenn]{fncychap}%Sonny %Conny %Lenny %Glenn %Renje %Bjarne %Bjornstrup
\usepackage{geometry, calc, color, setspace}%
\geometry{a4paper, headsep=1.0cm, footskip=1cm, lmargin=3cm, rmargin=2cm, tmargin=3cm, bmargin=2cm}

\begin{document}
\chapter{Characters}

\section{teste}
\lipsum \lipsum 
\end{document}

I've already looked at a lot of questions and all the answers change not only the first page, but all of the following, as well as changing the format of my title!

Answer 1

You could do something like this. You set the tmargin value to where you want your chapter title placed and then use the \topskip to set where the rest of the text will start.

\documentclass[12pt]{report}
\usepackage[brazil]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lipsum}
\usepackage[Glenn]{fncychap}%Sonny %Conny %Lenny %Glenn %Renje %Bjarne %Bjornstrup
\usepackage{geometry, calc, color, setspace}%

\geometry{a4paper, headsep=1.0cm, footskip=1cm, lmargin=3cm, rmargin=2cm, tmargin=1cm, bmargin=2cm}
\setlength\topskip{2cm}
\newcommand\newchapter[1]{\setlength\topskip{0cm}\chapter{#1}\setlength\topskip{2cm}}

\begin{document}
\setlength\topskip{0cm}\tableofcontents\setlength\topskip{2cm}
\newchapter{Characters}
\section{teste}
\lipsum \lipsum 
\end{document}