Renamon is tall and powerful for a Rookie level Digimon. She is far more mature than the other Rookie Digimon, considering her experience and her jaded view on life. Renamon's feral features and penetrating icy blue eyes can make her seem quite intimidating, even when she does not mean to give that impression. She seems to be able to teleport short distances. Renamon can also run at high speeds (at least fast enough to keep up with speeding traffic). Throughout the entire series, she hardly ever smiles. She has the Taoist symbol on both of her wrists and a cancer horoscope symbol on her thighs.

Renamon became Rika's partner after she received her D-Power (D- Arc in Japan) shortly after a Digimon Cards tournament. Many Digimon appeared to ask Rika to be their tamer, but at the end, Rika's choice was Renamon; "I just want one strong Digimon". Renamon remained as Rika's companion throughout the Tamers season. Renamon does not remember how she came to the real world from the Digiworld; she only remembers her partnership with Rika. Whenever Rika is alone, Renamon can appear to her.

At first, Renamon's view on humans was that they were just aids for Digimon in Digivolution, and her Tamer, Rika, thought that Digimon were just fighting machines. The two had a distant relationship. As time passed, their friendship grew stronger, having understood each other better, and the two saved each other on many occasions. It reached its zenith when, during the D-Reaper's attack, Rika told Renamon that she preferred fighting by Renamon's side over leaving the battle and saving herself. This enabled the final Bio-mergeance that sparked Sakuyamon's birth.

She gets along with Guilmon and Terriermon well, but she has an interesting love-hate relationship with Impmon, seen mostly in "Impmon's Last Stand", where she seemed very concerned for his safety. Impmon however, left the group and later became Beelzemon. After Biomerging to Sakuyamon, Renamon gains a compassion for life, and repeatedly shows concern for Impmon despite other dangers.