FIVE Over

The Five_OVER is a Powered Suit developed by Academy City. It is the "treasure" of Silvercross Alpha and its modelcase name is "RAILGUN". It has the capability of utilizing railgun methods better than the #3 esper, Misaka Mikoto.

Appearance
Its appearance is described to be like a five-meter-long praying mantis. It has two arms, two legs, and two sickles that can fold if needed to help it stand up. Translucent wings spread out from the armor. A large cylinder-like thing used to store lots of cannons rests on its back. There is also a shield on the front side of each of its front legs, with an artificial weapon placed between those shields.

Chronology
Kuroyoru Umidori has the dying Silvercross Alpha placed in it in order to dispatch and automatically pilot the power suit ; thanks to this, the Five_OVER's performance becomes greater than a simple AI-controlled suit. It later pursues Hamazura Shiage, Hattori Hanzou, Kuruwa, and Fremea Seivelun into a building in a coordination attack with other suits from Silvercross's collection.

After creating an elaborate trap and using various objects, Shiage and the others manage to take down the Five_OVER by damaging the suit to the point where its AI no longer becomes functional. When Kuroyoru attempts to kill Accelerator with thousands of artificial arms, the hijacked Five_OVER fires at her and destroys practically all of her equipment; Shiage had removed and replaced its control system with the Dragon Rider's suit, which allows him control of the Five_OVER.

Abilities
With its name referring to the third strongest of Academy City, its main weapon is a gatling railgun. It’s an armored suit with the replicated power of the third Level 5, and is completely based on the philosophy of "using only technology to create one that exceeds the original". Five_OVER can use its wings to move so fast that it can leave afterimages.

According to the author, the Five_OVER has a lot more powerful gun than Mikoto, but if the two were to fight, Mikoto would win due to application. However, the author also states that it isn’t an absolute, because science and technology will continue to advance.