Achilles' Heel: Melvin's is punctuality, apparently. He puts off murdering the one person who can keep him contained in Marik's body just so he won't be late for a children's card game.
Especially Zoidberg: Mai's loss dooms her to a world where everyone's breasts are bigger than hers. Especially Tristan's.
First Girl Wins: As a Fan Fiction writer, Tea believes very strongly in this trope, and is pissed when Joey doesn't automatically throw himself at Mai.
Friendless Background: Melvin brags that this trope protects him from having to worry about the shadow duel erasing the memory of anyone important from his mind. Too bad he didn't consider Mr. Tweetums...