Erika Kurumi is one of the Cures and the secondary main heroine of Heartcatch Pretty Cure!. She lives a fashion shop called "Fairy Drop", and she lives with both her parents, plus her older sister whom she is really jealous of. Her heart flower is the white cyclamen, though it can turn red if Erika experiences extreme jealousy of her older sister Momoka Kurumi. Her Cure ego is Cure Marine.

Erika is a feminine young girl who loves fashion and dreams of becoming a fashion designer. Everything she loves revolves around fashion, and she has turned it into an art form capable of helping others open up and feel their best. She is able to tell their feelings or moods using the color therapy she is going through. She is also a very fast learner and shows that when she puts her mind to things she has some skill.

Usually, she is cheery and energetic, but she has times when she can come off as selfish by acting lazy, childish, and immature. She has a short-temper and can be impatient, and she's pretty blunt and likely to be nosy when curious. This brash personality causes her to come off as abrasive towards more shy or reserved types, but at the same time she can become more mindful towards them and will always be there to comfort them should they need it. She cares deeply for her friends, even if she struggles to express it in a way that doesn't cause them further anxiety.

Despite their similarities and shared interests, Erika is very jealous of Momoka and often ignores or pushes her away as her sister attempts to help her or make suggestions. She wishes to surpass Momoka someday and would rather do it on her own then ask her for help. But over time she gradually begins to open up to her sister and grows less hostile.