List of Mega Monster Battle characters

Mega Monster Battle (大怪獣バトル, Daikaijū Batoru) is a multimedia project of Tsuburaya Productions' long-running Ultra Series. The story's main setting took place in the mainstream Showa Universe (Ultraman to Ultraman Mebius) where monsters on Earth went extinct after 500 years had passed. Humanity at that time began to colonize the outer space area and an event called Galaxy Crisis (ギャラクシークライシス, Gyarakushī Kuraishisu) took place, where Alien Reiblood summoned Bullton and caused monsters and aliens from the Ultra Series multiverse to appear randomly.

The Mega Monster Battle multimedia work includes:

Rei (レイ) is a human Reionics, ZAP SPACY's latest member and the main protagonist of Ultra Galaxy Mega Monster Battle and its succeeding series, Ultra Galaxy Mega Monster Battle: Never Ending Odyssey. He was once a baby that appeared during Bullton's attack on Planet Boris. During the series, he first appeared after being trapped inside the carcass of a Peguila and in amnesiac state, appearing to be hostile towards ZAP SPACY members despite saving their ship, Space Pendragon, twice while only cares about recovering his forgotten background. In the end, after being persuaded by Hyuga, Rei decided to join ZAP SPACY. During his membership within the ZAP SPACY crew, he was haunted by the image of the giant buried in the rock and challenged by a mysterious woman named Kate. At the end of the series, after defeating Kate, he discovered the woman as his older sister and the buried giant is Ultraman, whom asked his help to free him. Rei as well had awakened his true potential as a Reionics, becoming a figure known as Reimon (レイモン). During the second season, Rei participated into the Reionics Battle to determine the successor of Alien Reiblood to conquer the galaxy. Among them was Grande, an Alien Keel whom claimed to be his rival. Unlike the others, Rei on the other hand competed in the battle only to face Alien Reiblood, not wanting to inherit the latter's role as the ruler of the galaxy. In the middle of the series, he also encounter another giant, Ultraseven, which he rescued from Armored Darkness. After facing Alien Reiblood, he was finally brought to Earth for the first time. Sometime later in the movie, having recently finished Zaragas, Rei was spirited by Mebius, as he was predicted to be the chosen one capable of defeating Ultraman Belial. However, during the remaining Ultras' battle against Belial's army, he was corrupted by Belial into joining his legion until ZAP SPACY members awakened him from his senses. Followed by the arrival of Zero and the Leo Brothers, Rei was able to hijack Belial's Giga Battlenizer to ease the Ultra's battle, allowing Zero to finish him.

As a Reionics, Rei's initial monsters in his Battlenizer was Gomora, before he adopted Litra and Eleking during the series' progress. With other Reionics, Rei is subjected to the life-link rule with his monsters, thus would lose his life as well when one of them died in said battle, unless either Rei or his monsters sever their connections to save each other's lives. After Eleking's death by Grande's Tyrant, this caused Rei to succumb to his injuries until Kate upgraded his Battlenizer, allowing him to be on par with Grande's Tyrant. He was temporarily received Miclas by Ultraseven as a gratitude for saving him from the Armored Darkness until his final battle with Alien Reiblood. As Reimon, he is a mysterious alien who looks highly similar to Ultraman. He is the result of a fusion between an Alien Reiblood, and a human, Rei. When placed under extreme stress, he unleashes a Burst Mode (バーストモード, Bāsuto Mōdo), which also affects his Gomora. When in burst mode, his blue markings change to a crimson colour, black markings cross his body, and his eyes turn bright red. In this state, he becomes so powerful that he often loses his ability to tell his friends and enemies apart, but can be calmed back to his normal form with some effort. Reimon's attacks are the Sun Reionicrush (サンレイオニックラッシュ, San Reionikkurasshu) ray and a reviving ray, used to free and revive Ultraman. In the console game Ultra Coliseum, Reimon is capable of summoning a spectral version of himself to fight giant opponents. His finisher in the aforementioned game is Rei-MonsLoad (レイモンスロード, Rei Monsurōdo), summoning EX Gomora to perform EX Super Oscillation Wave.

Rei's personal monsters are:

Rei was portrayed by Shota Minami (南 翔太, Minami Shōta).

Io Mikura (御蔵 イオ, Mikura Io) is the main protagonist of the Mega Monster Battle: Ultra Adventure manga and the Mega Monster Battle: Ultra Monsters arcade game. A young boy who was originally a student of the ZAP SPACY with affinity for monsters, Io's favorite food is chocolate and his shirt has Nexus' Energy Core symbol. He was somehow brought into the past where Planet Boris was still in a good condition and immediately became a Reionics due to picking up a Battlenizer. He has his mother's ATM card, through which he performs an unlikely friendship with Kanegon. His true identity in the story was revealed to be the grandson of Karen Mikura.

In Ultra Monsters, Io's Battlenizer monster is optional to the player's choice, based on their own preference of cards. In Ultra Adventure, Io's Battlenizer includes: