A yakuake equivalent, using kitty, xdotool, wmctrl and xrandr
First, make sure you're using KWin as your window manager (by default if you're using KDE)
Second, install all the dependencies (lua5.3, xdotool, wmctrl and xrandr)
Third, copy the kikuake script somewhere in your PATH and make it executable
Fourth, setup some shortcuts, the most useful are kikuake --toggle and kikuake --togglefullscreen
Kikuake is controlled from the command line or through keyboard shortcuts, using the --show, --hide, --toggle, --togglefullscreen and --setopacity flags.
Additionally, it is possible to start kitty hidden using kikuake --start, but all the other flags will do it for you.