New element symbol

Question

I want to design a new element symbol. How can I add the red line and blue line (different codes \myin \mynotin ) to my code?

\documentclass[a5paper]{article}
\usepackage[margin=1.5cm]{geometry}
\usepackage{tikz}
\def\h {1.3ex} % cup and cap height
\def\w {1.2ex} % cup and cap width
\def\lw{0.12ex} % cup and cap line width
\def\spp{0.7269ex} % space before and after

\newcommand{\myinn}[1]
{
  \hspace{\spp}
  \tikz[line width=\lw,line cap=round,rotate=#1,baseline=-0.4ex]
  {\draw (-0.5*\w,0.5*\h) -- (-0.5*\w,0.5*\w-0.5*\h)
  arc (-180:0:0.5*\w) -- (0.5*\w,0.5*\h);}
  \hspace{\spp}
}
\newcommand{\myin}{\myinn{270}}
\begin{document}
\[\myin\]
\end{document}

Answer 1

It is not entirely clear, what is your problem. Exercise with drawing symbols as pictures (not recommended for use in documents) or to have symbols appropriate size.

Anyway, the standard use of your symbols:

\documentclass{standalone}

\begin{document}
text $\in$, $\notin$
\end{document}

gives good match sizes of symbols and text:

If this is not your problem/concern, please edit your question and clarify, what you like to have.

Answer 2

This produces your desired effect:

\usepackage{xcolor}
\usepackage{calc}

\newlength{\len}
\settowidth{\len}{$\notin$}
\newcommand{\mynotin}{\mbox{
{\color{blue}$\notin$}%
$\hspace{-\len}${\color{red}$\in$}%
$\hspace{-\len}${\color{black}$\subset$}%
}}
$a \mynotin\ S$