In Kingdom Hearts: Chain of Memories, Axel was the trump card for the rest of the Organization as a double agent in Castle Oblivion to keep track of Marluxia's plans. In Kingdom Hearts II, Axel betrayed the Organization for his friendship with Roxas and acted of his own accord to try and help Sora, though he originally wanted to turn Sora into a Heartless to get Roxas back. Axel appears in Kingdom Hearts 358/2 Days as a playable character in Mission Mode and one of the main protagonists.
As the Flurry of Dancing Flames, Axel uses two uniquely shaped weapons called Chakrams, and specializes in Fire manipulation. He can summon pillars of flame at will and strike with rapid combos using his Chakrams. He can also surround his Chakrams in flame and throw them like boomerangs, spinning and looping them to hit opponents multiple times. In his one on one battle with Roxas in Kingdom Hearts II, Axel also summons a circle of fire to surround them and leaps into the flames to hide, emerging to strike with rapid attacks, and then leaping back to keep his opponents off their guard. Axel is a powerful member of the Organization, arguably even stronger, or at least a better fighter, than Saïx. This is seen when Saïx is defeated by Roxas, but Axel was able to defeat Xion at the Old Mansion, who at the time absorbed much of Roxas's power. However, Axel clearly puts more effort into his battle, as he passed out after the fight, while Saïx remained conscious, though exhausted. Axel also effortlessly eliminated Vexen and dueled evenly with Marluxia. In Kingdom Hearts 358/2 Days, Axel has a Limit Break called Explosion. During Explosion, Axel throws his Chakrams at enemies while they're engulfed in fire, creating a small explosion of fire afterwards. While not being thrown, Axel's Chakrams spin rapidly, gathering fire. However, they can be thrown at any time, and do not need to charge. During Axel's Final Limit, Axel combines his two flaming Chakrams into one enormous flaming Chakram, easily many times larger than the two Chakrams. The explosion after the attack is also much larger. Only eight members (Axel, Saïx, Roxas, Xemnas, Demyx, Xaldin, Xigbar, and Luxord) of the Organization remained at the beginning of Kingdom Hearts II. Sora and his friends took every single remaining member down, saved Roxas, who became one with Sora, and Axel, who sacrificed himself so that Sora and his friends could save Kairi. In the end, Organization XIII is ultimately destroyed when Sora and Riku defeat Xemnas.
AbilitiesAxel utilizes two Chakrams, named "Eternal Flames". Each Chakram is circular and red, with silver spikes and circles around the edges, and two black handles shaped in a cross in the middle. Each Chakram has eight spikes, possibly referencing Axel's rank in the Organization. Axel is very adept in the use of his weapon; he can throw them, use them as shields, or use them as melee weapons. He performs some unique attacks, including juggling them against an opponent, or throwing one across the entire battlefield continuously.
He also uses them in conjunction with his fire abilities, setting the tips or the whole on fire before throwing them. From a scene in Kingdom Hearts Re:Chain of Memories, it is shown that he can set his Chakrams on fire from afar, acting as a remote detonator.
The Bond of Flame Keyblade, obtained from Axel, is similar in appearance to his Chakrams. Axel's Chakrams are among the few Organization XIII weapons that do not bear the Nobody symbol (the others being Xemnas's Ethereal Blades, and Roxas and Xion's Keyblades), but the spikes on the wheel do bear some similarities to the Nobody insignia.
In real life, chakrams are actually small razor-edged throwing disks used by warriors in ancient India. Axel's Chakrams bear more of a resemblance to Chinese wind-and-fire wheels, wheel-shaped weapons that are used strictly as melee weapons.