Niche

ニッチ

Lag's personal Dingo. She accompanies Lag, serving as his bodyguard against Gaichuu, and stays close to him along with her "pet," "Steak," perched on her head. She fights using her hair, also called "The Golden Sword," shaping it into powerful blade-like tentacles strong enough to lift objects several times her size. She possesses bearlike forearms and claws, which she typically keeps covered by oven mitt-like gloves. Niche exhibits animal-like traits, such as licking wounds and sniffing the air for signs of danger. She dislikes wearing pants, but wears them for Lag's sake, stating that he is the first male to make her wear pants. Lag estimates she is 7 years old based on her appearance.
Lag found Niche at a train station while on his way to his Bee Interview. She was a "letter," but the address on her mailing label was incomplete, and she was scheduled to be "abandoned" in two more days. Lag offered to take her to her new home ("Rabusamu Wandaun" according to the mailing label, which he believed was an orphanage) despite being on a deadline for his Bee job interview. During the journey, Lag discovered she had multiple names, so he named her Niche after where he found her—in a niche at the station.
After delivering Niche, Lag learned she was to be placed in a side show act as "The Child of Makka," with Makka being a mysterious being both worshipped and feared in AmberGround's Northern territories. Lag hurried back to Rabusamu Wandaun, using the excuse that Niche's delivery receipt had not been signed. Upon arrival, he found that Niche had already wrecked the sideshow tent with her "Golden Sword" and fled toward Gaichuu territory. He followed her and subsequently saved her from a Gaichuu. She decided to stay with Lag after he explained that her address had become unknown (since she had destroyed the sideshow), and she insisted that from then on she would be Lag's "Dingo."