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Physical Prowess and Amateur Swordsmanship
Due to his Innocence being largely used for close combat, Allen is known to be above human standards in terms of psychical fitness which making him to perform seemingly impossible workouts and hold back Akuma attacks that are known to take out walls. Known is that his psychical abilities are only increased when his Innocence is activated. After Allen received his Sword of Exorcism he began training with Kanda to develop his swordsmanship skills, though after losing in a spar he reverted to physical brawling.

Cross
is Allen's initial innocence parasitic type Anti-Akuma Weapon that is centralized in the cross-shaped, stone-like Innocence embedded in the back of Allen's left hand. The Innocence has caused Allen's entire arm to be taken over by Innocence, so his arm from the shoulder down is actually "foreign" tissue that his body symbiotically accepts as part of himself. Originally, Allen's arm was quite veinous and red, but over time its color has darkened and the skin has smoothed out, taking on a slightly more normal appearance. Allen can perform powerful techniques that meant to purify a Akuma. He uses it mostly for close combat techniques when his Innocence got invoked. Allen's Cross was nearly destroyed by Tyki Mikk.

Crown Clown

 * After Allen's Cross was nearly destroyed by Tyki Mikk, who crushed it and reduced it to particles, the Innocence particles hung around Allen, keeping him alive by healing a hole in his heart. When it was discovered that Allen's Innocence was still viable, Allen began to work hard to attempt to synchronize, though his initial efforts were all failures. It was only while battling Thread and gaining a new, strengthened resolve that Allen was able to properly reconnect with his Innocence, at which point it evolved.

When invoked, Crown Clown acts as a body-armored Innocence, forming a white-hooded cowl and sleeve of Innocence energy which covers his shoulders and right arm, while his left arm and hand become slender and black, clad in armor and razor sharp claws. A masquerade-style mask is always affixed to the cowl, which takes on various configurations and appearances. This transformation also changes Allen's usual hairstyle from flat to a spiky rear. As before, his Innocence possesses a certain degree of sentience, such as when Crown Crown is able to manipulate Allen's entire body like a marionette when incapacitated, or simply assisting in evasive tactics. When not activated, his arm is black and meets with his shoulder in a spiraling pattern that ends with tattoo-like emblem.

Sword of Exorcism

 * When Allen's synchronization rate exceeds 100%, he is able to transmute his entire left arm into a large broadsword with a cross emblazoned on the faces of the blade. In doing so, his left shoulder is capped with a cross-shaped emblem, and his cowl usually forms a cloak to cover the missing arm. Once invoked, the blade can exorcise evil from any vessel it strikes, though it does not harm humans; this means that Allen can damage the inner Noah of members of the Noah family without killing their human bodies. If used against Level 1 to Level 3 Akuma, it vanquishes them in the same effect as the Cross Grave attack, leaving a residual glowing cross crest in the wake of the defeated Akuma. However, in the case of a Level 4 Akuma the sword carries a diminished effect. Allen is shown with the ability to telepathically recall the Sword to himself, should it be separated from his body. It is noted by Lero that the design of the sword is the same as the sword of the Earl of Millennium except for the inverse of color.

The Cursed Eye
In addition to his Innocence, the reverse pentacle that scars his left eye curses Allen with the power to see the souls trapped inside Akuma. Allen received the cursed scar from Mana, who lashed out and cut Allen's face when he realized Allen had brought him back as an Akuma. Allen has said that it's "just like an Akuma" in the way that it evolves. The Earl, who was angered by the abilities of Allen's eye, has managed to develop seals that prevent the eye from activating. Sometimes, the pentagram section of the scar is drawn as the Sigil of Baphomet, the official insignia of the Church of Satan and an associated symbol of other organizations aligned with Satanism and the Left-Hand Path.

Nea Walker
During some point in his life, Allen was "implanted" with the presence of Nea Walker, the traitorous Fourteenth Noah who attempted to kill the entire Noah Family thirty-five years ago in a self-proclaimed effort to become the next Earl of Millennium. Although it is not clear how Nea's presence was implanted in Allen when Nea's coup failed and he was killed quite some time before Allen was even born, it is clear that the implantation had something to do with Mana, Nea's brother.

Nea's presence in Allen's mind has given Allen several key powers, the most prominent one being Allen's ability to control the original Noah's Ark.

However, Nea has also begun to take over Allen's body, having been seen taking dominance several times and controlling Allen's body for brief periods, one time doing this to openly taunt the Earl and announce his intentions to return and become the next Earl of Millennium. It has also been explained to Allen that Nea's gradual return will eventually completely destroy Allen's presence in his own body; though it had already started to happen when Allen had been told this, Allen having been seeing an odd, looming shadow that no one else could see, recently Nea's return efforts have been more violent, Allen once coughing up blood as he attempted to fight him off and, more recently, Akuma starting to flock to Allen's side to attack him, claiming to feel the presence of a Noah, which shows that Nea's presence is closer to the surface than it previously was.