@Aikibujin I got one more mnemonic for you - sorry, still pirate related, but given how hard it was to actually have that image in mind, One Piece was maybe the only place to find this one 
売 - う - Sell - Level 5
(Koichi’s Mnemonic: There’s a samurai with (just) his forehead and legs. Everything in between is missing. What happened to everything in between? He was low on money, so he had to sell it all, leaving him only the top and the bottom.)
It was the only thing I could think about, haha 