Annoying Younger Sibling: Kokoa would continually pick fights with Moka as a child in a single-minded goal to get a win, something that continued to happen over the years until now. Considering they come from a family of vampires, these fights would become increasingly intense and murderous.
When Ginei and Rubi make a Big Entrance, the Newspaper Club thinks that they are there to save them from Kokoa, when really they are just doing a photoshoot.
When Kokoa has a Villainous Breakdown after beating Outer Moka, Tsukune thinks that she was just dealing with abandonment issues and that all of this aggression was how she expressed her sisterly love. In reality, she really does hate Moka, or at least Outer Moka. What she really wanted Inner Moka.
When it looks like Kokoa is going to fight Inner Moka, she winds up hugging her and crying, happy to see her real sister again.
Breaking the Fourth Wall: Kurumu bawks when she realizes that Nazo wasn't just the show's narrator. Later, they both gawk at the writer's ingenuity for adding the bat in the show for him to be Kokoa's weapon.
Implacable Man: After Moka left for the human world and had her powers limited with the rosario, Kokoa continued to follow and terrorize her relentlessly until she went to Yokai Academy.
Might Makes Right: When Inner Moka willingly goes back to being Outer Moka, Kokoa thinks that she became just like her "wimp" friends and vows to reverse it.
Monster of the Week: Moka's younger half-sister Kokoa Shuzen, an arrogant vampire attending her freshman year at Yokai hell-bent on killing Outer Moka.
Tempting Fate: After Kotsubo and Kagome make a fuss about Kokoa's destructive behavior to Nekonome, she asks if she has been causing more problems, clearly not wanting to discipline her. It is right then when the room shakes and pictures fall off of the wall, Kokoa very loudly proclaiming that she would knock down the entire school to get to Moka.
