Monobeasts

The Monobeasts are minor characters introduced in Danganronpa 2: Goodbye Despair and were used by Monokuma during the Killing School Trip to prevent the Class 77-B from accessing the various islands connected by bridges to the central island.

They are a collection of 5 animal-themed giant robots used by Monokuma to keep the students in line, the Monobeasts first appeared from Jabberwock statue on the central island at Jabberwock Park under the authority of Monokuma, treating them as his own pets. When they are first introduced, Monokuma presents their power using Usami as an example by commanding them to attack her. After they're introduced they take up residence in front of the bridges on the central island, blocking the students from crossing them to the other islands until Usami begins destroying them one by one.

Prologue - Welcome to Dangan Island! Panic at the Heart-Throbbing School Trip!?
Once Monokuma had gathered the Class 77-B at Jabberwock Park, he explained that he would like them all to participate in the Killing School Trip however when Nekomaru, Akane and Peko threatened him with force in disagreement he responded with a force of his own, summoning the Monobeasts from Jabberwock Statue. The statue crumbled away to reveal 5 exact replicas of the animals on the statue but in giant robotic form and were an almighty force against the students, being almost 4 times the size of the students or bigger.

Monokuma decided to make Usami an 'example to everyone' and commanded Eagle Mecha to attack her with two gatling guns attached to its wings. It was able to obliterate Usami, down trees behind her and caused a gash on Hajime's cheek during the onslaught spray of bullets. After Monokuma had made his point known, that disobeying him would result in the same punishment, he and the Monobeast's left together.

Chapter 1 - Destination Despair
Each Monobeast, Horse Mecha, Eagle Mecha, Tiger Mecha, Snake Mecha and Gorilla Mecha are placed standing guard by each bridge with a barrier gate for extra precaution to make sure the students of Class 77-B have no access to the other islands. They do not move from these positions and stand stationary.

Chapter 2 - Sea and Punishment, Sin and Coconuts
The next morning after the first class trial, the Class 77-B gather at the Hotel Restaurant to discuss the situation when Monokuma appeared. He stated that one of his Monobeasts at gone missing and that he was looking for it, despite his inquiry, the class do not know what has happened to it so Monokuma promptly leaves. Usami then appeared and Chiaki asked if she knew anything about the disappearing Monobeast, Usami explained that she had defeated it and had released the lock on the bridge gate thus allowing the class access to the 2nd island.

After the class had finished their discussion, Hajime proceeded to the 2nd island bridge and found that the Monobeast had indeed disappeared.

Chapter 3 - Trapped by the Ocean Scent
The next morning after the 2nd Class trial, the remaining class gather in the Hotel Restaurant for discussion and Usami once again appeared, stating she had defeated yet another Monobeast and had released access to another island. The class are still overwhelmed that she's able to defeat such large monsters.

After they had finished their discussion, Hajime headed for the 3rd island and noticed that the Monobeast had once again disappeared.

Quotes

 * “To be honest, I'm searching too. My valued servant...has disappeared.” (Monokuma talking about Monobeasts)
 * “Maybe I cut back on the cost of their food too much? Perhaps they're boycotting me?” (Monokuma talking about Monobeasts)
 * “Surge... O gods who dwell between light and darkness... In accordance with our contract, I summon thee now... Come forth, Monobeasts!” (Monokuma introducing Monobeasts)
 * “After a fierce battle that's never been seen in history, I've finally succeeded in conquering the last Monobeast.” (Usami talking about Monobeasts)
 * “With the Monobeast gone we crossed the fifth bridge and arrived at the final island.” (Hajime Hinata talking about Monobeasts)

Trivia

 * In Danganronpa 3: The End of Hope's Peak Academy - Side: Hope, members of Class 77-B fought the Ultimate Elite Task Force and the two robot unit's allied with them that Nekomaru Nidai and Kazuichi Soda were fighting could be seen as a reference to the Monobeasts from the Neo World Program due to their similar appearance and mechanical strength.
 * Usami defeats each Monobeast one by one but despite this it is unknown how she defeats them and what happens to them after as her battles with them are done off-screen.