Yoh’s Abilities:
小鬼ストライク Ko-Oni Strike
This is one of the Asakura clan’s onmyôji magic. With this magic, an onmyôji can summon shikigami — familiar spirits — from leaves or bits of paper to do their bidding. They are most useful, from anything from household chores to assassinations. Yoh never truly mastered Shikigami magic, but displayed the capacity to use it at age 10, under tutelage of his grandfather, Yohmei Asakura. At best, he could only invoke three Shikigami from the leaves. Overall, however, this is a minuscule technique compared to Yoh’s more advanced shaman magic.
御経 Okyō
A sutra taught to him by Anna. It is a Buddhist exorcism chant of the Sankiraimon, or the Three Refuges that would send any spirit with knowledge of Buddhism who hears it to the hereafter. However, as it is a written language media, the sutra mainly works on spirit whom identify with the culture of eastern shamanism, which Yoh eventually discovered during his entry exam against Silva; almost sending Amidamaru to heaven. This was omitted in the English dub.
憑依合体 Hyōi Gattai
Translation: VIZ “Spirit Integration”, literally “Spirit Unity”
This shamanic technique enables the shaman to integrate spirits into their body, forming a “unity” of both, their spirit and that of the ghost. The shaman would enter a special trance which enables them to synchronize their spirit with that of the ghost; allowing the ghost to possess their body and enabling the ghost to interact with the physical world. Furthermore, once integrated, the shaman takes on the knowledge & wisdom of the ghost as well as their personality. Though it is unknown when Yoh learned this technique.
オーバーソウル Over Soul
Initially, Yoh learns how to create the magical Over Soul indirectly during his battle with the Shaman Fight officiant, Silva. By integrating Amidamaru’s spirit with that of his sword, Harusame, and subsequently, the heirloom antiquity, the Futsu-no-Mitama no Tsurugi, Yoh forges the ethereal Over Soul. This shamanic technique quickly becomes Yoh’s quintessential mode of shamanic combat and his most versatile tool.
超占事略決 - 巫門遁甲 Chō Senji Ryakketsu - Fumon Tonkou
One of many spells Yoh learned from the contents of the Ultra Senji Ryakketsu that Anna brought to him from Master Yohmei. Using this spell enables one to read the flow of furyoku and determine its course. Effective use can render most magical attacks ineffective.
超占事略決 - 三日月ノ祓 Chō Senji Ryakketsu - Mikazuka no Harae
This was a secret exorcist magic left to Yoh by Matamune, to help vanquish the Oni that Anna created. However this magic depleted the reserve furyoku within Matamune, and as a result, sent him to the hereafter.
阿弥陀流 真空仏陀切り Amidaryū: Shinkuu Buddha-giri
Translation: VIZ “Amida-Style: Shockwave Buddha-Slash”, literally “Vacuous Buddha-Slash”
Amidamaru’s signature technique developed when he was still alive. Its principal use is to strike at adversaries outside of his sword’s range. Essentially, it breaks the air with a slash and forces out a powerful shockwave at the adversary. Through constant “Spirit Integration” Yoh learns this technique, albeit through muscle memory. With the introduction of the Over Soul, this technique has been somewhat modified, instead expanding the Over Soul over a distance, rather than a shockwave slash. The name of this technique was changed to “Celestial Slash” in the English dub.
阿弥陀流 後光刃 Amidaryū: Gokōjin
Translation: literally “Amida-Style: Halo Blade”
Amidamaru’s most revolutionary technique. It is a dual-sword battō-jutsu technique executed from his unique and legendary fighting stance, called Tathagata. During execution, both swords are unsheathed at incredible speed at dead-range of the adversary, unleashing a strike with enough power to bust an adversary to shreds. Since then this technique has been modified for use in Over Soul mode; instead using the magical power of the Over Soul to cut the enemy to pieces in one swift sword-draw.
阿弥陀流 大後光刃 Amidaryū: Dai Gokōjin
Translation: literally “Amida-Style: Grand Halo Blade”
The advanced form of the normal Gokōjin. Using the normal, 'Over Soul'-ed Gokōjin as a primer, and powered by Amidamaru’s newly-acquired seirei-class powers, this high-level technique focuses furyoku and destroys anything with a decisive strike of cutting furyoku waves using his Over Soul “Spirit of Sword”.
阿弥陀流 無無明亦無 Amidaryū: Mu-Mu-Myou-Yaku-Mu[1]
Translation: directly “Amida-Style: No Existence of Ignorance”
Yoh’s ultimate magic which he creates during his journey through the underworld using the enlightened powers of Amidamaru (in O.S. Byakkou mode). The magic is rooted in the power of purification, which dissolves a person’s spiritual power into nothing. The magic generated by Mu-Mumyou-Yaku-Mu cancels out the furyoku of another shaman, thus neutralizing it. The name is based on a portion of the Heart Sutra. This was never used in the English dub.
Over Soul Manipulation
Not necessarily an ability, but rather creative use of currently-existing ability. Before the time at Amidamaru evolved into a seirei-class spirit, and his Over Soul was still immature, it fell upon Yoh’s talent of a shaman to fully utilize the abilities of his Over Soul. To that end, on various occasions, Yoh has altered the shape and formation of his Amidamaru Over Soul. Such formations include a defensive Amidamaru Shield (阿弥陀丸シールド

, which makes use of the Over Soul’s armor for protection. As the Over Soul evolved, the Amidamaru Shield was incorporated thusly, eliminating the need to alter its shape for protection.
Also, though canon only in the anime, was the 'Over Soul Missile', which induces an explosive thrust of his Over Soul to launch himself at his target. He makes use of this method during his final battle with Hao in the anime.
Ichigo’s abilities:
Though he does not possess any formal shinigami rank, Ichigo’s overall abilities are great enough that he can fight on the level of an elite shinigami captain. According to Aizen and Urahara, Ichigo’s most astounding ability is his growth rate: he grasps the basic control of advanced techniques in days where it should take weeks or even years. For example, he masters flash steps in less than three days while training with Yoruichi, done simultaneously with his acquiring of bankai. Also, because of his power level, he has been able to use high level shinigami techniques early, such as sensing 'Spirit Threads', which Rukia says only top level shinigami can use.
Physically, Ichigo is in top form even when not in his spiritual body. Ichigo has been trained in martial arts since he was a small child, both professionally and by his father’s constant assaults and surprise attacks when at home. He regularly fights with and defeats bullies and gangsters, whose skill rivals that of his friend Tatsuki, the 2nd-best female martial artist in Japan (she was better than him until middle school).
When he is in his shinigami form, Ichigo’s already impressive strength is greatly enhanced. He can leap several stories into the air, and in one case even fought off three shinigami lieutenants and their released zanpakutō bare-handed in rapid succession; he shattered one of their zanpakutō in a single punch. The arrancar Ulquiorra has claimed that Ichigo’s spiritual power at its peak is even greater than his own, but that it fluctuates wildly when he is in conflict with his inner hollow. Because he has far more spiritual energy than his body can contain, it leaks out constantly, preventing him from hiding it and effectively making stealth impossible when dealing with other spiritually-aware creatures.
In terms of fighting style, Ichigo relies mostly on his zanpakutō and the use of flash steps, and thus would be considered a swordsmanship specialist. Ichigo has never been formally taught kidō and has trouble controlling his spirit energy in all but the most basic of ways, due in part to the sheer amount of it he has.
Unlike most lieutenant and captain strength shinigami, Ichigo is able to fight with his full power in both the human and spiritual worlds. While captains and lieutenants have their power limited to a fifth of its normal level during trips to the real world in order to avoid unnecessarily influencing surroundings, Ichigo holds no rank in the Gotei 13 and thus has no such limit.
Rules of battle:
This is a friendly battle, no bloodlusting and they will not do anything they wouldn’t normaly do
Ichigo does not get his Hallow powers, it tips the scale Way to far
This fight happens in a Roman stadium type battle field.