/usr/share/cowsay/cows/hellokitty.cow is in cowsay 3.03+dfsg1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | ##
## Hello Kitty
##
$the_cow = <<EOC;
$thoughts
$thoughts
/\\_)o<
| \\
| O . O|
\\_____/
EOC
|