|This article is about a/an villain in Denji Sentai Megaranger.|
Cruel and ruthless, Guirail's methods involved tactics that even his allies found guilty, such as kidnapping children to use as living shields and performing bizarre experiments on the Nezire Beasts. Among the powers he possessed included energy blasts, superhuman speed, and a dagger that could extend into a full-length sword.
First appearing during a nighttime raid on the city, Guirail engaged the Megarangers where he used his speed to switch out a Kunekune with Megared's (Kenta Date) friend Takeshi, resulting in Takeshi taking the attack Kenta had intended for the footsoldier. Later, as Guirail attacked a significant communications center, he attempted to manipulate Megared's guilt until a message from the recovered Takeshi restored Kenta's will to fight, and Guirail retreated after receiving a firm thrashing from Megared's new Battle Riser.
With Neijirejia's tactics becoming more aggressive, Prof. Kubota and I.N.E.T. responded with the creation of a secondary mech, the Delta Mega, to backup Galaxy Mega. Gurail himself responded by enhancing Crocodile Nezire with the power to split into two upon receiving a fatal blow and sent him to deal with the Megarangers while he went after Delta Mega's chief programmer, attempting to force the scientist to surrender Delta Mega's command program by taking his son hostage. Again, Gurail was thwarted by MegaRed, who was then able to activate Delta Mega to help the others deal with the dual Nezibeasts.
- See also: Darkliptor
Mad GuirailFollowing his failure as Giga Guirail, Guirail was given the experimental NeziGen Capsule by Dr. Hinelar, which had been initially intended for the now damaged Yugande, much to Shibolena's outrage. After luring out the Megarangers, Guirail swallowed the capsule and with its power surging through him, easily bested all five Megarangers at once. Before he could deliver the killing blow, however, Guirail's body began to mutate, and he was forced to retreat. Confronted by Dr. Hinelar and Shibolena, Guirail was informed that although the NeziGen Capsule would increase his strength to unparalleled levels, the side effects would destroy his mind and warp his body. The two then abandoned Guirail as he transformed into a giant degenerate version of himself called Mad Guirail (マッドギレール Maddo Girēru) and began to rage across the city. Although the Megarangers attempted to stop him in Super Galaxy Mega, Mad Guirail's power and mindless fury proved too much for them to handle while even their new finisher, the Big Bang Attack, failed to inflict any significant damage. As Guirail's mutation resulted in him spawning the Nezi Beast Gigire from a piece of his own body, the Megarangers were forced to retreat in Delta Mega to the I.N.E.T. moonbase with Gigire in hot pursuit, leaving Mad Guirail to continue his assault on the now crippled Galaxy Mega. As Mad Guirail prepared to finish his opponent off, the Megarangers returned in time to save Prof. Kubota and the others with their latest weapon, the Mega Voyager. Against the Megarangers' newest and most powerful mecha, Guirail had finally met his match and ultimately became the first opponent killed by Mega Voyager's Voyager Spartan attack.
But despite falling in battle, Guirail would continue to haunt the Megarangers even in death as Dr. Hinelar recovered the remains of Mad Guirail and used them to create a new breed of a warrior for Neziregia, the Psycho-Nezilar.
GigireDuring Mad Guirail's fight against Super Galaxy Mega, the power within him became too much for one body to hold, resulting in a piece of him breaking off and transforming into the Nezi Beast Gigire (ギギレ Gigire). As the two double-teamed Super Galaxy Mega, the Megarangers were forced to retreat to I.N.E.T.'s moonbase in Delta Mega, only to find that Gigire was flying after them. After using Delta Mega's thrusters to blast him away, the Megarangers faced Gigire again after obtaining the Voyager Machines from Yuusaku Hayakawa. They managed to destroy him with Rovoyager-1 and Rocket Voyager-3's Voyager Double Attack before combining into Mega Voyager to fight Mad Guirail.
- Guirail's name comes from the Japanese word Kireru (切れる), which means to cut.
- His appearance is based on bandages, as well on Freddy from Nightmare on Elm Street
- Darkonda - Power Rangers counterpart in In Space. See comparison page.
- Mutantrus - Power Rangers counterpart in In Space. See comparison page. (Gigire)
- Darkliptor - Power Rangers counterpart in In Space. See comparison page. (Giga Guirail form)