When a shellfish becomes a drunkard and sees a cross, they'll become a robber. Because they'll steal the cross!
Once the shellfish has a taste for being a robber, he'll join a Bosozoku (ぞく) bike gang so he can keep stealing more and more crosses. He'll drink more, steal more, and get to ride cool motorcycles.
Currently there are no similar looking kanji which exist in the WaniKani learning system