In its soul, a narwhal that's supposed to do construction under the moon, will be too lazy to do it. And when your soul is lazy, there's no way you'll be able to get something done.
You can't tell the lazy narwhal he's being lazy because he's your dad (だ). If he was anyone else you'd tell him off for being lazy, but you can't tell off your dad. That's just not right.
Currently there are no similar looking kanji which exist in the WaniKani learning system