I removed today K3B because I thought that I would never burn a CD and now pretty much the whole plasma DE is marked as orphans:
sudo pacman -Qtdq
and I got this as output:
ark aspell-en cdrdao clementine dolphin-plugins dvd+rw-tools gwenview js kate kcalc kde-gtk-config kde-servicemenus-rootactions kdesudo kfaenza-icon-theme kfind kinfocenter kopete kscreen kwallet-pam kwayland-integration kwrited libburn libkcddb nm-connection-editor okular oxygen pamac-tray-appindicator plasma-desktop plasma-pa qtcurve-gtk2 qtcurve-kde qtcurve-qt4 spectacle sweeper transmission-qt user-manager vlc xdg-user-dirs
Which pretty much seems to me the whole Plasma DE.
I removed K3B using the PAMAC and luckily I do not have selected the option to removed all unnecessary dependencies :)
Thanks a lot for the help. Cheers