Phoenix Ikki (鳳凰星座の一輝 Fenikkusu no Ikki?, Ikki meaning "gleam") is drastically different from his fellow Saints. He is almost the opposite of his younger brother Shun is calm, soft, caring and very emotional, whereas Ikki is harsh, cold, aggressive, and very much of a loner. Fellow Saint Wolf Nachi once pointed out that it was very hard to believe Ikki and Shun were related due to the extreme difference in their personalities. Ikki's Cosmo is unique to him -- it is full of hatred, anger, incredible aggression and power, but it was still guided by his deep love and loyalty for his younger brother, his friends and loyalty to Athena. Although he dislikes teamwork, he comes to battle whenever Athena's Saints need his help, and is often seen coming in the nick of time to save his younger brother and friends from certain death. This tactic has always been exploited to their advantage, since the enemies are caught by surprise upon meeting/fighting him. He is a noble, complex and mature character, who does not doubt whenever it's necessary to sacrifice his life for his friends.
Ikki is hinted many times to be the most powerful Bronze Saint as he often pitted against the strongest enemies. Like the myth of the Phoenix, his power increases every time he is killed and resurrected. In his battle with Virgo Shaka, Ikki was able to awaken his 7th sense, which placed him in the ranks of Gold Saints in terms of power and skill. He also awakened the 8th sense. As a Saint, Ikki uses two techniques to dispose of his enemies; one deals physical damage, and the other destroys the mind of his foe.
His physical attack is Phoenix's Wings Rise (鳳翼天翔 Hōyokutenshō?), which gathers forces of wind and heat into a concentrated point, then unleashed as a single blow. This attack covers a wide range of distance and it is Ikki's signature move. It may also be used on multiple enemies at the same time. In the manga, the attack is performed strictly with his palms only; in the anime, it is revised to include his fists, although the Phoenix Saint has utilized the original manga form of the technique on several occasions.
His other attack is Phoenix Illusion Demonic Fist (鳳凰幻魔拳 Hōōgenmaken?), which is infamous for destroying the minds of its victims -- the technique is dealt from either a single fist or a finger. Concentrating his Cosmo into his fist to literally destroy his opponent's mind. Once used, it sends various nightmare illusions directly created by the opponent's brain; he or she is trapped within an illusion that is almost indistinguishable from reality. It also considerably weakens ones's control of the Cosmo and depth of perception to reality. Ikki's Phoenix Illusion Demonic Fist usually spells doom for the one in the receiving end -- unless he has an unusually powerful mind or Cosmo, such as a Gold Saint.
In addition to weakening and trapping an enemy in a powerful illusion (followed by instant death) this attack also serves to dwelve deep into an enemy's mind - as was the case when this attack was used on Gemini Kanon during his reign in the Poseidon story arc and many other characters in the anime-only Asgard chapter.
In some battles, Ikki first uses the Phoenix Illusion Demon Fist to paralyze his rival, and then deals the Phoenix's Wings Rise to finish him off.