Don't pull a Kaneda

His main character pose is chewing the skin off of his thumb. In the anime, he also picks at his skin and wounds, collecting the scabs and otherwise in a jar.

...Tamiya dislikes pineapple.

...In the anime, it is heavily implied that the other members of the club see Raizou as a female.

...Dafu told Tamiya to kill him, in order to save Tamako a demise of being crushed by Litchi.

...Nico was ashamed of having to work for his money.

...It's shown that, after Zera's encounter with the fortune teller, Jaibo followed Zera home. This is visible in chapter 3, page 3 of the prequel.

...Thanks to Zera's clairvoyance abilities, he was able to foresee Kimura, Matsushita, and Yamada's attack, leading him to smear varnish on his desk.

...The boys that bullied Zera and Dentaku, were called "Kimura", "Matsushita", and "Yamada".

In chapter 2, page 5 of the prequel, Kaneda suggests: "Pretty sure it could travel through a man's skull", when talking about the fire power of a slingshot. (Dafu exclaims: "Eeeeek!")

...The Hikari Club already existed for one year, before Zera joined.

...Zera disobeyed his own rule. Number seven states: "Eternity is impossible. Therefore, the Hikari Club is not permanent. Regardless, we are humanity's sole line of light!" He later opposes this very commandment, while trying to lecture Tamiya about them.

...Zera admitted to Tamiya that he would use force against the members that disobeyed the rules.

...Nico was the head of the Imperial Guard - therefor, above everyone else. Even Tamiya, who was the founder and leader of the Club.

...Nico and Dentaku had a mutual respect for eachother throughout the years, admiring eachothers skills.

...The members are obligated to button up their collars, because Zera's father left it open.

...Hamasato doesn't wear the regular white collared shirt, but a black-white striped shirt.

...Nico was an excellent Catcher in baseball.