Tekkan Aira

"Facing outrageous evil! Smashing the darkness of fear! The Daybreak Detective! DekaBreak!" "Six! It's good to be invincible!"

Tekkan Aira (姶良 鉄幹) is DekaBreak of the S.P.D. and Dekarangers.His nickname is Tetsu (テツ). His designation is the roman numeral VI.

Dekaranger
A super elite from SPD's Tokkyou division who was sent to earth to fight the Hell Siblings, an elite group of Alienizers who have already destroyed 79 planets, Earth being their next target. An Alienizer named Genio killed Tetsu's parents when he was about five years old. Tetsu was raised by the Space Police off-planet. He pilots the DekaBike. His catchphrase is "Nonsense!".

His fighting style is the Seiken Accel Blow, a martial art style of that all Tokkyou officers use when battling Alienizers and utilizes the BraceThrottle for various effects.

In episodes 26, 45, and in Magiranger vs. Dekaranger, Tetsu dresses up in drag to disguise himself. There's some indication that he is interested in Swan-san. In addition, he treats Umeko like a baby sister. He also develops a strong friendship with Ban, calling him "Senpai" (veteran), and promptly replaces him as Jasmine's partner when Ban joins the Fire Squad.

Tetsu appeared in GoGo Sentai Boukenger vs. Super Sentai when he was investigating a case when Eiji came in. Later on he is seen with Tsubasa, Nanami and Asuka as they aid Eiji in defeating Chronos. He transferred his "Justice Spirit" power to AkaRed to power DaiVoyager.

Gokaiger
A few years later, Tetsu fought alongside not only his own team, but every single Sentai ranger in existence, against the Empire of Zangyack when it attacked the Earth in the Great Legend War. After fighting against hundreds of Gormin and their Zgormin commanders. AkaRenger noticed the fleet moving towards them, he gathered all the Rangers together and gave them the order to sacrifice their powers to wipe out the first invasion's armada.

After the Zangyack Empire was defeated by the Gokaigers, Marvelous returned the Ranger Keys to their original owners. It is assumed that Tetsu and the rest of the Dekarangers received their keys and were able to utilize their transformed abilities once more.

Akibaranger
DekaBreak appeared with his team, as part of the six official Sentai, transforming into their Ludicrous Power which combined with the others to form the Ludicrous Cannon Bazooka, which the Akibarangers used to destroy Kameari Alpaca.

SPD Mecha

 * DekaBike / DekaBike Robo
 * Blast Buggy

Arsenal

 * BraceThrottle: The personal changer of a Tokko which allows him/her to change into Dekasuit. Henshin call is "Emergency! DekaBreak!". When the throttle is turned it enables for the user to use specialized punch based attacks. Also has a built in Communicator and Judgement Mode functions as well. In given times, the device is also used as a life support system and fire extinguisher.
 * Throttle Techniques
 * Speed Increase
 * High Speed-Fist: Lighting Fist (高速拳: ライトニングフィスト, Kōsokuken: Raitoningu Fisuto)
 * Super High Speed-Fist: Super Lightning Fist (超高速拳: スーパーライトニングフィスト, Chōkōsokuken: Sūpā Raitoningu Fisuto)
 * Strength Increase
 * Powerful-Fist: Power Fist (豪力拳: パワーフィスト, Gōrikiken: Pawaa Fisuto)
 * Super Powerful-Fist: Super Power Fist (超豪力拳: スーパーパワーフィスト, Chōgōrikiken: Sūpā Pawaa Fisuto)
 * Electric Shockwave
 * Blitzkrieg-Fist: Electro Fist (電撃拳: エレクトロフィスト, Dengekiken: Erekutoro Fisuto)
 * Super Blitzkrieg-Fist: Hyper Electro Fist (超電撃拳: エレクトロフィスト, Chōdengekiken: Haipā Erekutoro Fisuto)
 * Fireball Attack
 * Scorching-Fist: Fire Fist (灼熱拳: ファイアフィスト, Shakunetsuken: Faia Fisuto)
 * Cyclone Blast
 * Tornado-Fist: Tornado Fist (竜巻拳: トルネードフィスト, Tatsumakiken: Torunēdo Fisuto)
 * Fire Extinguisher
 * Spray-Fist: Impulse Fist (噴射拳: インパルスフィスト, Funshaken: Inparusu Fisuto)
 * Super Spray-Fist: Super Impulse Fist (超噴射拳: スーパーインパルスフィスト, Chōfunshaken: Sūpā Inparusu Fisuto)
 * Deletion Techniques
 * Superman (Flying) Punch Finisher (Tetsu's Default Deletion Attack)
 * Certain Kill-Fist: Sonic Hammer (必殺拳: ソニックハンマー, Hissatsuken: Sonikku Hanmā)
 * Uppercut Finisher (Actived while Tetsu is using Super Lighting Fist.)
 * High Speed-Fist: Lighting Upper (高速拳: ライトニングアッパー, Kōsokuken: Raitoningu Appā)
 * Rushing Punch Finisher (seen in DekaRed vs. DekaBreak)
 * Flash-Fist: Plasma Fist (閃光拳: プラズマフィスト, Senkouken: Purazuma Fisuto)
 * Shining Fist (シャイニングフィスト, Shainingu Fisuto): A Rapid-fire Punch attack when being launched from the MagiLamp Buster (seen in Magi vs. Deka). Unfortunately, Tetsu had to deal with Smoky the Magical Cat first...
 * Machine Boxer

Ranger Key
The DekaBreak Ranger Key (デカブレイクキー) is Tekkan's personal Ranger Key and what became of his powers after he along with the rest of the 34 Super Sentai sacrificed their powers to end the Great Legend War.

This key, along with the other fourteen sixth ranger keys and the ten extra hero keys, were initally acquired by Basco ta Jolokia and later used by the Gokaigers. Like all of his Ranger Keys, Basco used his trumpet, the Rapparatta, to turn the DekaBreak key into a puppet to do his bidding. The copy DekaBreak was one of the first five sixth rangers that Basco showed Captain Marvelous (Gokai Red), revealing he had found more Ranger Keys. These five puppets fought the Gokaigers and were all defeated, with DekaBreak being defeated by Gokai Pink. Basco left these five keys to Marvelous.

A short while after, the first fourteen Sixth Ranger Reys, along with all the Ranger Keys of the first 33 Super Sentai, were briefly taken by the Black Cross King and turned into Ranger puppets that were fought by the Gokaigers and the Goseigers. The DekaBreak key was among ten of these Sixth Ranger Keys who fought, and were defeated by, Gosei Knight.

While in the possession of the Gokaigers, the DekaBreak Ranger Key was mainly used by Gai Ikari (Gokai Silver), who used it to fight as DekaBreak. It was also used by Joe Gibken (Gokai Blue) on one occasion.
 * Alongside Don (DekaGreen) and Ahim (DekaPink) while fighting against Zangyack.
 * When the Gokaigers became the Dekarangers in their fight with Barbaric Officer Chirakashizky.
 * Joe became DekaBreak as part of an all-white Gokai Change in the Gokaigers' fight with Makuu Prison Chief Ashrada.

After Zangyack were finally defeated, the Gokaigers gave the Ranger Keys back to their rightful owners. It is presumed that Tekkan received his key and became DekaBreak once more.

Portrayal
Tekkan "Tetsu" Aira is portrayed by Tomokazu Yoshida (吉田 友一). As a child, he is portrayed by Yuta Komuro (小室 優太). As DekaBreak, his suit actor was Eitoku (永徳).

Dub names
In the Korean dub of Dekaranger entitled Power Rangers S.P.D., which aired in South Korea, Tekkan does not use a nickname and keeps his real name, while his Ranger designation is S.P.White.