So, Yakuake is disabled in Autostart - System Settings and I have unchecked "Open window after program start" in the Yakuake configurations. It still ignores everything and autostarts every time I boot the machine.
Also, side question: I selected "Turn on" in the keyboards setting "NumLock on Plasma Startup" and it worked... for a couple days only. But not anymore. Should I create a new thread for this?