The protagonist of this world. She's a beautiful girl as long as she stays quiet, but she's actually a total psycho who constantly spews dirty jokes, sexual harassment, and genocidal remarks. She has a foul mouth and occasionally has mental breakdowns. She's harsh toward Agekin but generally kind to other monsters—though she'll hurl verbal abuse at them if they're weak. She has immense talent as a monster tamer. She constantly subjects Marisa to sexual harassment and inappropriate comments. She's a bit dim-witted. She supposedly has a "Reimu-chan Sensor" near her ears that detects Creeper explosions instantly, and she can pinpoint nearby life forms through life-sensing. She can also guess the color of soybeans within a 50-meter radius. She is accompanied by a dragon named Elvarias. Elvarias follows Reimu, attacking with bites and fire breath. It seems Elvarias might have fought the mastermind behind the original rebellion in the past...?

The other protagonist. Relatively pure-hearted. Usually speaks casually. A poor, beautiful girl who is constantly sexually harassed by Reimu (though lately, she just brushes it off). She has a bit of a sharp tongue at times. Even when she speaks, she remains a beauty. She knows most dirty jokes but rarely says them. She plays the straight man and occasionally screams. She's harsh toward Agekin but very kind and considerate toward other monsters. Even if they're weak, she helps them with a motherly instinct. She has the talent of a monster tamer, using her intellect to identify enemy weaknesses and give precise orders to defeat them. She's smart. Well-endowed. She's often forced into "this and that" by Reimu.

The first boss-tier monster Reimu and the others captured. His real name is King Charger. He was strong when first caught, but after being nerfed and becoming incredibly weak, everyone started treating him harshly. He once ran away during a boss fight, but his mental fortitude is strong enough that he eventually awakens. He's the self-sacrificing type who would do anything for his friends. A total coward and weakling, yet he's always with Reimu and the others. He is the King of chick monsters and a pet created by Pluto, the God of Treasure. He's strong when he awakens (not that he necessarily will). He's genuinely funny. Mostly dragged around by Reimu and the others, serving as the straight man. Sometimes he cries or goofs off with Reimu. He has a pathetic finishing move called "Agekin Special." He looks up to Wither.

The strongest. The hidden boss of this world captured by Reimu and the others. Despite being caught relatively early, he remained the strongest until the end. He fires barrages from his heads to cause explosions. He talks like a mafia boss. Cool-headed. He constantly complains about the low ceilings in the house. He's on good terms with Reimu and Marisa. He treats Agekin like a subordinate, but deep down, he respects him a little. He knows the true identity of the monster that started the rebellion long ago.