For most icons, you can use the far- prefix to pick the regular icon. By default, without a prefix, the icon style used will be solid. However, the copyright icon is a bit of an exception, because the old FA4 icon has been renamed to the FA5 regular version, and we have a mapping in core that essentially forces both copyright and far-copyright to use the regular style.
I think we can soon fix this, you’ll soon be able to correctly use the solid style for the copyright icon.
For “cuttlefish”, did you try adding “fab-cuttlefish”? This is a brand icon, hence the fab- prefix. Make sure you add this to both setting fields.