You slip off the roof, your life flashes before your eyes, and you smash your mouth on the ground causing some serious damage. Oof, this is a really bad injury, you fell all the way off the roof and onto your mouth.
As you try to assess the damage, you hear someone shout, "Guy (がい), hey, you okay, guy?" They run up to you, but your mouth is too damaged, you can't respond. "Okay guy, I'm gonna call you Guy now. Let's get you to the hospital."
Currently there are no similar looking kanji which exist in the WaniKani learning system