These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Music of Awesome: In the drama, the Capsule song "Flash Back" starts up every time Akiyama ends up turning the tables. The movie covering the finals of the tournament may get another one with its theme song, "Love or Lies."
Complete Monster: In a slightly different example, Yokoya definitely fits. He doesn't directly kill or hurt anyone, but while everyone else is in the Liar Game to win money to pay back their huge debts, Yokoya has plenty of money and only plays the game to manipulate people for his own amusement. He couln't care less whether or not people end up with millions of dollars in debt and will probably be traded as slaves to pay it back. He also used money, fear, and distrust to take control of his high school as a teenager. Although the 1941 Hitler is his role model(itself an obvious indicator), he thinks Hitler's greatest crime is not finishing what he started. As a matter of fact, this quote says it all:
Freud Was Right: The fact that Akiyama is so attached to Nao due to her being incredibly similar to his mother - both in looks, and personality. Yikes.
What an Idiot: Nao, in almost everything she does at first. Fukunaga comments on this at the end of the first period in the fourth round.
"This girl really is...a flaming idiot."
Subverted and eventually averted. Subverted in that Nao's actually extremely intelligent, but she allows her tendency to believe the best in people cloud her judgement and never seems to get particularly angry when she falls for traps. Averted later in the manga when she becomes one of the best players in the liar game.
The Woobie: Abe. Beaten by her stepfather and told right to her face by her own mother that she shouldn't have been born.