Izaki Shun is the leader of Suzuran High's Class D and is known for both his strength and his smarts. A wily and crafty Senior, he was initially unwilling to side with either Serizawa Tamao or Genji Takiya without gauging their strengths firsthand. Under the ruse of offering his friendship, Izaki challenges Genji to a fight and eventually emerges the victor by ambushing him with a number of goons. But his win was not so easily gained - Izaki may have won that fight, but he is so impressed by Genji's strength, that he finally makes his decision and signs up with the GPS.
Never one to let down his guard, Izaki serves as the faction's voice of reason and the first to call everyone out on their antics. He always keeps another eye open for any new developments, and as such, is usually the first person to alert Genji to alarming situations.