Momiji Sohma is 15 and is a painfully adorable and seemingly androgynous teenager with a depressing family life that he hides behind his smile and fun-loving attitude. His endless enthusiasm and cuteness often annoys Kyo; not to mention that he's older than he looks, much to Tohru's surprise.

Momiji is the Rabbit of the Zodiac and is the son of one of the richer people of the Sohma family and Tohru unknowingly cleans the building for her job.

He has a younger sister named Momo who can only speak German. He is actually very insightful and emotionally strong despite his upbringing and his appearance. He took to Tohru very quickly, he even ignored the fact that he was a Zodiac and hugged her when they were formally introduced. Much to Kyo's horror, Momiji likes to wear the girl's version of their high school uniform albeit with short shorts and not a skirt.

Momiji likes Tohru when he first meets her. He is the younger cousin of Yuki, Kyo, and Shigure.

Although, Momiji acts kind, he has a terrible secret regarding his mother. He vows that he'll always keep all of his memories no matter how bad or good they are, because he knows that someday, he'll be able to overcome the pain and be able to cherish them -- like treasure.