Gender: Male Age: 11 Height: 140cm Oldest Brother: Oh Taeo Second Brother: Oh Raeo Older Sister: Oh Mio Younger Brother: Oh Pio

Gender: Male Age: 17 Height: 172cm Older Brother: Oh Taeo Younger Sister: Oh Mio First Younger Brother: Oh Jio Second Younger Brother: Oh Pio

Gender: Female Age: 15 Height: 157cm Oldest Brother: Oh Taeo Second Brother: Oh Raeo First Younger Brother: Oh Jio Second Younger Brother: Oh Pio

Gender: Male Age: 10 Height: 125cm Oldest Brother: Oh Taeo Second Brother: Oh Raeo Older Sister: Oh Mio Third Brother: Oh Jio

Gender: Male Age: 20 Height: 178cm First Younger Brother: Oh Raeo Younger Sister: Oh Mio Second Younger Brother: Oh Jio Third Younger Brother: Oh Pio The eldest of the five siblings, he is in charge of making a living. He is 20 years old, three years older than the second eldest, Raeo.

The main culprit who made life difficult for the five siblings. When the siblings struggled to survive after their parents went missing, they turned to him for help. However, Megi tricked them into a fraudulent contract, burdening them with massive debt. He is exploiting their hardship to seize both their money and their house.

A grandmother from outer space. She came to Earth to find Biklonaut warriors to fight against the Humma Empire and is currently renting a room in Jio's house.

An attendant serving as an assistant to Lee Sunhee, who arrived on Earth aboard the Eomjiho. He is a radio-shaped robot with arms and legs. He mainly assists Lee Sunhee by explaining necessary mission information to the Earth Biklonauts or investigating data alongside her to protect the planet.

Gender: Male Age: Unknown Rank: Inspector Affiliation: Humma Empire Physical: 194cm, 82kg An inspector of the Humma Empire and a villain.

Jeon Siyong's aide. Although he addresses Jeon Siyong as "My Lord," he does not actually respect him.