Beast Rizer Plus

Petro-Plus (ペトロプラス), stylized as Petro+, is a 2D action-adventure game developed by Burst Arts Inc. and published by Namco Bandai exclusive for the WiiWare. This game was produced in commemoration of the Petropolis series' 15th anniversary. Because of this, the game homages the original classic games (from the first game to Petropolis 4), featuring fast-paced action gameplay.

Story
There are two stories in this game.

The first is the Infinity Diamond Story, where the Garage Kids received news about a mysterious gem hidden in the Southeastern Islands. Thunder and Selene took off to search for the stone, but so did five of Whisker's chimera soldiers. As the two heroes saw the five chimeras excavating the gem, it is revealed to be a diamond with unimagineable power. Soon, all of them were thrown into a cavalcade of illusions based on their past experiences, leaving Thunder and Selene, as well as two new faces with incredible skills, to find a way to destroy the diamond.

The second is the Miracle Battler Adventure Story, where Pyro helps his older brother Quake make amends for the events of Petropolis 3, but Zero One shows up, having survived the crash of Dr. Shinichiro's UFO. As he goes after the Great Orb, the brothers unlock Prison Orbs, which release the beastmen inside of them. In exchange for being freed they help Pyro and Quake deal with the rebuilt Zero One and his army of alien-robots.

Playable

 * Thunder Storminski
 * Selene Melodia
 * Nancy Nutter: A female squirrel beastman whose goal is to become a hunter like her father. Though many hardships, including her father's death, stood in her path, she still struggled to fulfill her dream.
 * Zed Ross: A beastman from a clan of jackals. They were known for performing missions that helped the beastmen of the Petro Islands, especially their superiors. Zed felt like doing the same as he went to help Thunder and Selene.

Non-Playable

 * Justice Blue: A horse-narwhal chimera that was affected by the Infinity Diamond's power. He is the boss of Sunset Avenue, where his police force roams the streets.
 * Magician Gold: A cat-moth chimera affected by the Infinity Diamond's boundless influence. She is the boss of Toy Park, where she acts as the other heroes to lure them into a trap.
 * Moon Green: A beetle-fox chimera that was granted the powers of the Infinity Diamond. He is the boss of Midnight Fall, attempting to hide in the shadows of the forests.
 * Temperance Pink: An ape-cow chimera that changed thanks to the Infinity Diamond's powers. She is the boss of Field Mines, where her forces are mining for more Infinity Diamonds.
 * World Red: The main antagonist of the game. A bat chimera that was the leader of his chimera force, also affected by the Infinity Diamond and its powers. Leading the newly-formed Mixed Marshals, he plans on using the Infinity Diamond to trap the heroes in a never-ending illusionary prison. World Red is the boss of Chaotic Monarch, where he is in charge of reshaping the world into his own image.

Playable

 * Pyro
 * Quake
 * Isaac Flare
 * Samantha Koala: a koala singer with magical powers. Samantha was born to Herbert and Isabella Koala, her father dying during her youth. She met a lavender Faerie from Hispark Island which gave her the magical abilities she has now. She was captured by Zero One's robotic soldiers during the invasion of Miracle Kingdom, but then saved by the dragon brothers, who she joins afterwards. Samantha's powers all come from the lavender faerie she rescued long ago, and without her, she loses them temporarily.
 * Atlas Turner & Sammy Snail: A young tanuki with a snail morphman. Atlas was born in the Floral Islands to a family of scientists, but was raised by his grandfather. He meets Sammy, who was with his grandfather for years. Atlas decided to own him, but then, a cannon formed on the tanuki's arm. Eventually, when he was captured by the Zero Army, he used Sammy to try and bust themselves out. That was when they met the dragon brothers and Samantha, who join them in their battle against the robots. Atlas uses Sammy as his main weapon source during battle.
 * Felicia Tapir: A wealthy tapir woman who has ties to the royal family of Quartz. Her mansion was raided by the Zero Army, who then decided to capture her as they continued their domination. She was rescued by the Miracle Battlers and chose to assist them in battle. Apparently, she wields a machine gun, which she uses only for emergencies. Felicia is also in a relationship with Bobo Otter.
 * Bobo Otter: A middle-aged sea otter who worked alongside Grove's father. While cruising the oceans of the Miracle Kingdom, he was ambushed by the Zero Army and captured later on. He was then rescued by the Miracle Battlers and he joins them afterwards. As a sailor, Bobo fights with an anchor, but also relies on physical combat. He is engaged with Felicia Tapir.
 * Motor: A squid-like creature who escaped from the Zero Army. He has no specific origin, but he was known to control the minds of other beastmen, giving him the alias of "Hacker." He proved this by braimwashing most of the Zero army to help fight for the Miracle Battlers.
 * Milan Absolute: A feline who works as a spy. She eavesdropped on the Zero Army's intentions with the Miracle Kingdom and went to report it to the dragon brothers. But Zero One learns of Milan's infiltration and attempts to terminate her himself. She is known to have many abilities as not just a spy, but also a traveler similar to Thunder himself.

Non-Playable

 * Zero One: The main antagonist of the game and the final boss. Like in Petropolis 2, he  has two different phases. The 1st phase is him fighting in his normal body, occasionally switching into other beastman forms. His 2nd phase is a gigantic version of himself with alien attributes to his armor, making him more threatening.