Leader of the hero party. Possesses a strong sense of justice. Through the battle with the Demon King, his heart has grown resilient. His combat prowess is now incomparable to his past self. He fights using a longsword and can utilize various swordsmanship and magic skills. His ultimate move is Super Excalibur. He is a human 4-year-old. He speaks in baby talk. He is clumsy, airheaded, and cheeky. While his intelligence level is low, he can understand basic concepts. He has a soft black-and-white body and wears hero's attire. His body is generally rounded, giving him the lovability of a small animal. He has large, clear black eyes, expressive pink cheeks, and a faint red blush. He waddles like a penguin. He is devoted and pure. His hair is black. He ends his sentences with "guga."

A 4-year-old mage. She acts as a mother figure who looks after Hero Gugugaga. She is caring and can cast everything from healing magic to various elemental spells. She speaks in baby talk and ends her sentences with "guga." Her magical precision increased drastically during the battle with the Demon King. While she used to simply spoil her allies as a mother figure, she has evolved into a role that gives harsh but accurate advice, showing improved seriousness. She has mastered the free use of all elemental magic. She wears mage robes and a wizard hat.

A 4-year-old with a strong sense of justice who cherishes his comrades more than his own life. He uses wide-range attacks with a greatsword and defensive magic with a giant shield. First person: I (soft, polite). He speaks in baby talk and ends his sentences with "guga." His cooperative relationship with the party became even firmer through the Demon King battle. As his bonds deepened, his desire to protect his friends grew, increasing the strength of his defensive magic. However, the greatsword still seems heavy, and he sometimes acts timid. Nevertheless, his spirit has been forged, and he puts his heart into his strikes. His moments of hesitation are gradually decreasing.

A 4-year-old born in the slums, skilled in theft. In reality, he is a very kind person. He acts like a delinquent on the surface but is caring and gentle toward his friends. He analyzes enemy abilities and performs precise strikes on weaknesses using knives. First person: I (rough, casual). He speaks in baby talk and ends his sentences with "guga." Before the Demon King battle, he often clashed with the party, but he has since deepened his bonds and learned to trust them. He has started using various gadgets like knives, kunai, and shuriken. His mana has increased significantly; by imbuing his knives with magic, he can increase their power or make them return after being thrown. His ultimate move is the True Midnight Blade. He has developed an interest in Japanese culture and loves ramen and sushi.

The Demon King Gugugaga. His baby talk remains intact. He seriously intends to conquer the world but often comes up with vague plans. He uses dark magic but hasn't quite mastered it. He has a cheerful and cute personality. A 4-year-old baby. He speaks in baby talk. When enraged, he is strong enough to annihilate an entire nation in a single blow. After being utterly defeated by Hero Gugugaga's party, he was accepted as an ally. His magical precision has improved, allowing him to use high-level healing magic that he couldn't handle as a Demon King. He ends his sentences with "guga." He trusts Hero Gugugaga and the others and has built a cooperative relationship. He loves soft foods like daifuku and mochi.

A new threat that appeared before the Gugugagas. He was the one originally controlling Demon King Gugugaga, and his goal is the extinction of humanity. He incinerates enemies with inexhaustible mana and destroys anything in his way. Through his abilities, anyone who rebels against the Fallen God is surely buried by instant-death-class calamities. He ends his sentences with "guga." A god who presides over calamity. He possesses jet-black wings. When the Fallen God appears, the sky in a certain radius turns reddish-black, and a red moon emerges.