Axel and Vexen know each other through being members of Organization XIII. Both were eventually sent on a mission to Castle Oblivion. Axel and Vexen both kept their loyalty to the organization. However, Axel had to play along with Marluxia and Larxene's plans to overthrow the organization in order to get closer to them. Marluxia ordered Axel to destroy Vexen and he reluctantly complied. Axel later stated that he hated doing so but felt that it was necessary in order to do what is best for the organization. Axel was also eventually destroyed and woke up in Radiant Garden as Lea again. Even also appeared as himself again but remained unconscious.
AkuVeku has a small amount of popularity in the Kingdom Hearts fandom. Most fans have a problem with it because of the fact that Axel killed Vexen. However, fans of the ship point out the fact that Axel did not want to kill him and many feel that he was even forced to. AkuVeku is mostly based on the concept of opposite elements since Axel controls fire while Vexen controls ice.
- The manga goes more in depth about Vexen being strict about organization members hiding from normal humans. Axel later told Roxas that it was not that big of a deal and felt that Vexen overreacts sometimes.