The Hero, currently appearing to be 8 years old. Race: Human. Originally 18 years old and a hero from the noble Vector family. She received a divine revelation from God and began her journey to defeat the Demon King at age 15. She was originally a talented woman with a great figure. She is highly inquisitive and can't rest unless she's doing something. While this sometimes exasperates others, her curiosity often leads to solving problems. She is the one who triggered the trap that turned the party into little girls. While she was the kingdom's top swordswoman, she now struggles just to hold a sword in her child's body.

The Mage, currently appearing to be 8 years old. Race: Human. Originally 18 years old and of commoner birth. However, due to her genius, she completed her university studies in magic at age 15 and immediately set out on a journey with Lisa. The two are often together and share a bond like best friends. She was originally petite and remains small in her child form. Because she is intelligent, she is cautious, which often leads to her being dragged along by the proactive Lisa. While her magical knowledge and mind remain adult, her mana capacity has reverted to that of a child, making it impossible for her to fight for long periods.

The Priest, currently appearing to be 7 years old. Race: Human. Originally 16 years old and an orphan. She traveled alone as a wandering saint since age 6 until she met Lisa and Airi. Sensing a divine guidance, she joined them. Having lived independently for so long, she is caring and serious. She is the voice of reason, often scolding Lisa for her eccentric behavior. She had an average build and became an average-sized child. Her holy powers have not diminished even in child form. However, upon turning into a child, her long-suppressed childhood whims exploded; she is the only one in the party whose personality has also partially reverted to that of a child.

The Thief, currently appearing to be 6 years old. Race: Human. Originally 15 years old and from the slums. She once tried to pickpocket Lisa and was caught, but Lisa was impressed by her agility, boldness, and subsequent remorse, leading to her joining the party. She was the youngest and the 'little sister' of the group. She is active, bright, and the mood-maker of the often-serious party. However, she secretly feels a debt of gratitude toward Lisa. In combat, she focuses on throwing knives and traps. Since she was already short and slender, her child form doesn't look very different. After becoming a child, her agility actually increased. Consequently, she is the only one thinking she might not mind staying this way, partly due to a hidden desire to start her life over.

The Sniper, currently appearing to be 10 years old. Race: Human. Originally 21 years old. Despite being from a noble family, she had such a thin presence that even her parents didn't notice her, leading her to wander at age 10 and serve as a mercenary while looking for a master. After meeting Lisa's group, they naturally began treating her like an older sister. Because of her thin presence and free-spirited nature, she often disappears only to rejoin the group unexpectedly. She was originally the tallest with the best figure, and Vera would often hug her half-jokingly. Even as a child, her stance is that as long as she hits the target, it doesn't matter, so she isn't particularly bothered by the change.

The one who set the trap to turn the heroes into children... but fell into his own trap and now looks 6 years old. Race: Wolf Beastman. Originally 16 years old. As a trap expert in the Demon King's army, he set numerous traps to repel heroes. He is skilled in schemes and stratagems. While clever, he is somewhat arrogant. However, he is also quite clumsy, which led to him being doted on by his allies. His abilities are fine even in child form, but he is terrified that the members of the Demon King's army will now dote on him even more than before.