Make No Password Required on local linux (tty) login

I want to allow a user that is logging in to the system locally (ie. keyboard & mouse) to not have to enter a password. Is this possible? I have the system locked down extremely well with SSH, and it sits with me always, so I it is not an issue.

This may be bad security but as noted if you have physical access to a non encrypted laptop you could get into the files and reset passwords with a linux live cd/usb or sometimes the grub menu lets you boot to recovery root and you can change the password.

Do you mean a virtual console or the default graphical console?

Login Settings (GNOME/KDE) should have option to boot to desktop without password.

For Virtaul Consoles

Arch linux has a guide which I think should work for other systemd distros.

https://wiki.archlinux.org/index.php/Automatic_login_to_virtual_console

run

systemctl edit getty@tty1

and put the following into the file

[Service]
ExecStart=
ExecStart=-/usr/bin/agetty --autologin username --noclear %I $TERM

I think that should let you autologin to the first console.

Following from the great information from @Roman I modified his answer somewhat for the solution on my system, which was Debian. For anyone else needing this; for Debian, edit /etc/systemd/system/getty.target.wants/getty\@tty1.service and add --autologin root to the line which begins with ExecStart=- so that it reads:

ExecStart=-/sbin/agetty --autologin root --noclear %I $TERM

Hope that helps. I realize it is a security risk in most cases. But when it is an embedded router that is strapped to the bottom of my desk and all external authentication is done with 2 factor authentication... I am not too worried.

Thank you for the help @Roman!