Akira (A.R. World)

Kamen Rider Amaki (仮面ライダー天鬼, Kamen Raidā Amaki?) is a fictional character in the 2009 Kamen Rider Series Kamen Rider Decade. Amaki appears in the World of Hibiki, but was not present in Kamen Rider Hibiki. "Amaki" literally translates to "Heavenly Demon".

Akira
Akira (アキラ, Akira?, portrayed by Nana Akiyama) originally appeared in Hibiki as Akira Amami (天美 あきら, Amami Akira?), the Oni apprentice of Kamen Rider Ibuki. In Hibiki, she steals Ibuki's Onteki and briefly transforms into what is called Transformed Akira (あきら変身体, Akira Henshin Tai?).

In the version of reality that is the World of Hibiki in Decade, Akira is again under the tutelage of Ibuki and his Ongekidō: Ibuki Style (音撃道・威吹鬼流, Ongekidō: Ibuki Ryū?) as one of his best students. During Gyuki's rampage, she transforms into Amaki and fights alongside Todoroki in order to save their friend Asumu, all without Ibuki's permission. Braving his displeasure later, she and Todoroki convince Ibuki and Zanki that combining the three schools would be the best thing for the future of Ongekidō. With Tsukasa's help, they convince their masters, and she is promoted from apprentice to teacher. However, she later ends up in the World of the Rider War with Asumu and Todoroki before being killed off by Saga.

Kamen Rider Amaki
In this form, Amaki is a blue Oni. To assume this form, Akira blows into her whistle and air gathers around her like a tornado, causing her body to transform into that of an Oni. Amaki also gains a second "oni face" which is a crest that forms on her forehead. In Decade, Amaki resembles Ibuki, except for being shorter with lighter blue coloring. In the S.I.C toy line, Amaki ("Transformed Akira") has silver instead of gold armor and accessories.

Equipment
Just like Ibuki, Akira was given the ability to transform into Amaki within the Transformation Whistle Onteki (変身鬼笛・音笛, Henshin Onibue Onteki?) by using special sound waves. She blows into the whistle and places it in front of her forehead forming an Oni face as a whirlwind covers her as she transforms. Along with Ibuki Style's Ongeki Weapon, the Ongekikan Reppu (音撃管・烈風, Ongekikan Reppū?, "Gale") usually used in its "gun mode" it fires Oniishi which shells out a heavy amount of damage to the enemy. For her finisher, Amaki fires charged Oniishi into the Makamou prior to connecting the Ongekimei Narukaze (音撃鳴・鳴風, Ongekimei Narukaze?) and a mouthpiece that completes Reppu's "trumpet mode" to perform the Ongekisha Shippu Issen (音撃射・疾風一閃, Ongekisha Shippū Issen?, "Gale Flash"), the Oniishi are then ignited by Sound of Purification through the Reppū as Amaki inhales deeply then begins blowing through the trumpet. The waves of wind and sound engulf the large Makamou, reacting to the tracking shots fired by Amaki before the initial attack. Finally the trumpet creates a large wave which destroys the Makamou.