Erika is a fair-skinned girl with medium-length dark blonde hair with a orange hair accessory which supports her side tail that faces to the right direction and dark yellow-green eyes.
Along Sarina Shizukume and Ai Kawano, Erika is a mean and cruel bully as they love to torment Aya Asagiri everyday. Erika is also rude also watched as a senior named Shota Arai tries to rape Aya, but Aya escaped so she and Shota looked for her. She is also cruel as she mocked Aya about the cat she cared for by saying "The guts went everywhere." before throwing the collar to Aya, which triggered Aya to use her Stick and indirectly killing them both.
Erika's death was the reason that Sarina's hatred for Aya grew, though Sarina's hatred didn't last long. Her death was also one of the reasons why Sarina became a Magical Girl.
She is also a delinquent, further proof of this is when one student said ''“Both of them were delinquents anyway, so aren't they better off dead?”'' who was often rather pleased that Shota and Erika are dead.
- In the anime and manga, it is shown that Erika and Shota Arai are the first two people to get used a stick on by Aya Asagiri.
- Erika and Shota's deaths were also the first to show in the anime and manga.
- Erika Kaijima, Alice Misumi and Melissa Maina Mitsushiro are the only known characters to have first names that aren't Japanese. Their first names are common in the American and Europe continent.
- In Episode 1, some of the students who delighted with the shadow of Erika and Shota's accidental death and laughed away spreading unfounded rumors such as heart and triangle relations were fun.