She first appeared in the chapter Counciling where she got furious about Vexus letting Barasia join the Cluster.
Rika Nonaka is a tomboyish girl from a family consisting of her youthful mother and grandmother, known as the "Digimon Queen" due to her experience in the Digimon card tournament. Eventually, Rika finds a Blue Card which enables her to receive Renamon as her partner. At first, Rika sees Digimon as nothing more than data and wanted to make Renamon the strongest Digimon in the world. But after the ordeal with IceDevimon, Rika ends their partnership out of fear. However, Rika comes to Renamon's aid and the two begin their partnership anew on mutual terms.