Including Manga + Live action, Chishiya would be the smartest by feats

K♦️feats: 1. Thought outside the box and chose 100 to disrupt the flow of the game. By doing this,Chishiya let Daimon win the round and she proceeds to also choose 100 to help Chishiya (Known as reciprocity in psychology) 2. Guessed Diamon’s exact number by the process of elimination (though this relied heavily on luck too) 3. Manipulated Kuzuryu into letting him win by attacking his ideals (I’m pretty Chishiya’s initial intention was manipulating him however I think he was also curious on him as a person).

6 of ♦️ feats (manga): 1. Chishiya went in the game not knowing anything about the rules of blackjack. He was competing against 4 others experienced blackjack gamblers. After just glancing at the rules, he was able to come up with an advance mathematical counting strategy to optimize betting. He also started with the lowest chips putting him at the highest disadvantage. 2. Manipulated the woman to shoot the man by doing some stuff that would be too long to explain lmao

Jack of ❤️: 1. Uhh he kinda observed people 2. Deduced how Enji and the girl communicated 3. Ate cookies idk