A demonstration of the Noto Serif CJK and Noto Sans CJK fonts, using XeLaTeX or LuaLaTeX.
\begin
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\documentclass{article}
\usepackage[vmargin=2cm,hmargin=3cm]{geometry}
\usepackage[CJKspace]{xeCJK}
\usepackage{xpinyin}
\setmainfont{Noto Serif Light}
\setsansfont{Noto Sans}
% \setmonofont[Scale=MatchLowercase]{Noto Mono}
\setCJKmainfont{Noto Serif CJK SC}
\setCJKsansfont{Noto Sans CJK SC}
\setCJKmonofont{Noto Sans Mono CJK SC}
\def\biangS{\char"30EDD}
\def\biangT{\char"30EDE}
\usepackage{multicol}
\usepackage[colorlinks]{hyperref}
\begin{document}
The Noto Serif/Sans CJK fonts (also known as Source Hans Serif 思源宋体、Source Hans Sans思源黑体）have a huge glyph coverage of ideographs. Here's a sampler using a short excerpt from the lyrics of 《生僻字》(\emph{`Rare words'}) written by 陈柯宇 Chen Keyu, which contains a large number of rare and archaic Chinese ideographs.
\begin{multicols}{2}
\begin{verse}
茕茕孑立，沆瀣一气。\\
踽踽独行，醍醐灌顶。\\
绵绵瓜瓞，奉为圭臬。\\
龙行龘龘，犄角旮旯。\\
娉婷袅娜，涕泗滂沱。\\
呶呶不休，不稂不莠。
\end{verse}
\sffamily
\begin{verse}
咄嗟、蹀躞、耄耋、饕餮；\\
囹圄、蘡薁、觊觎、龃龉；\\
狖轭鼯轩，怙恶不悛。\\
其靁虺虺，腌臢孑孓。\\
陟罚臧否，针砭时弊。\\
鳞次栉比，一张一翕。
\end{verse}
\end{multicols}
Test for Traditional Chinese: (Compare the punctuations to that of Simplified Chinese.)
\begin{multicols}{2}
\CJKfontspec{Noto Serif CJK TC}
\begin{verse}
兩個黃鸝鳴翠柳，\\一行白鷺上青天。\\
窗含西嶺千秋雪，\\門泊東吳萬里船。
\end{verse}
\CJKfontspec{Noto Sans CJK TC}
\begin{verse}
兩個黃鸝鳴翠柳，\\一行白鷺上青天。\\
窗含西嶺千秋雪，\\門泊東吳萬里船。
\end{verse}
\end{multicols}
Noto Serif and Sans CJK also have glyphs for \href{https://blogs.adobe.com/CCJKType/2017/04/designing-implementing-biang.html}{\pinyin{biang2}}, used in the name of a \href{https://en.wikipedia.org/wiki/Biangbiang_noodles}{Chinese noodle dish}.
\begin{center}\Huge
\biangT\biangS \quad \sffamily\biangT\biangS
\end{center}
Test for Japanese:
\begin{multicols}{2}
\CJKfontspec{Noto Serif CJK JP}
\begin{verse}
秋来ぬと、\\
目にはさやかに見えねども、\\
風の音にぞおどろかれぬる。
\end{verse}
\CJKfontspec{Noto Sans CJK JP}
\begin{verse}
秋来ぬと、\\
目にはさやかに見えねども、\\
風の音にぞおどろかれぬる。
\end{verse}
\end{multicols}
Test for Korean:
\begin{multicols}{2}
\CJKfontspec{Noto Serif CJK KR}
\begin{verse}
오늘이 오늘이소서 매일이 오늘이소서\\
저물지도 새지도 말으시고\\
새려면 늘 언제나 오늘이소서
\end{verse}
\CJKfontspec{Noto Sans CJK KR}
\begin{verse}
오늘이 오늘이소서 매일이 오늘이소서\\
저물지도 새지도 말으시고\\
새려면 늘 언제나 오늘이소서
\end{verse}
\end{multicols}
The Noto CJK fonts respects regional writing conventions for the same ideograph. Here are the same ideograph 述typeset with Noto Serif CJK for different regions:
\begin{center}
[SC] {\CJKfontspec{Noto Serif CJK SC}述}\quad
[TC] {\CJKfontspec{Noto Serif CJK TC}述}\quad
[JP] {\CJKfontspec{Noto Serif CJK JP}述}\quad
[KR] {\CJKfontspec{Noto Serif CJK KR}述}
\end{center}
You can set a default CJK serif and sans font for your document by loading the \texttt{xeCJK} package, then use the \verb|\setCJKmainfont{...}| and \verb|\setCJKsansfont{...}| commands. (See preamble of this example project.) You can always switch to a different CJK font in the middle of your document using \verb|\CJKfontspec{...}|. Remember to compile your project \href{https://www.overleaf.com/learn/latex/Choosing_a_LaTeX_Compiler}{with the XeLaTeX or LuaLaTeX compilers}.
\end{document}