|Full Name||Chiba Erika|
|Other Name||Erika Rozen Katori|
|Affiliation||Hundred Families (Chiba)|
|School||First High School|
|Weapons & Equipments|
|Voiced By||Yumi Uchiyama (Anime)|
|Novel||Volume 1, Chapter 1|
|Manga||Volume 1, Chapter 2|
|Anime||Episode 1, Enrollment Chapter I|
Leo and Erika often time bicker in a pseudo-antagonistic manner, though the two share a camaraderie and a close friendship. Many times throughout the series otherwise have asked if they were a couple, which both have fiercely denied.
It is shown that the other characters in the anime have considered the possibility of them being a couple.
Shizuku has stated in the anime that the two of them being a couple wouldn't be that surprising.
Erika herself personally trained Leo in developing his sword-based magic.
The two appear to share a close friendship. Erika acknowledges that Miyuki is in a whole other class in magic, but she still treats her with the same respect as she would anyone else. Erika is usually the one who teases about Miyuki's close relationship with Tatsuya.
Likewise, Miyuki seems to trust Erika enough to confide in her about Tatsuya's secret. She also shares Erika's mischievous personality, as she joins her in binding Honoka when Pixie was announcing Honoka's strong feelings towards Tatsuya.
Mizuki can be considered as Erika's best friend since she and Erika usually tag along together and hit it off quite well. They care for each other's well-being.
Mizuki senses that Erika may have strong feelings toward Tatsuya.
Through several hints in the novels, it is implied that Erika may have strong feelings for Tatsuya as she says that she feels that Tatsuya has changed her. In Volume 1 chapter 5, she indicates that she's interested in him, something that has happened before, but she had thought that it might be different. In Volume 3, when Tatsuya was chosen as a competitor and he felt depressed on the stage because of the negative atmosphere and pressure from the audience, Erika led her classmates from the rear-half Weed section, through the Bloom section to the almost-front row of the audience to cheer for Tatsuya, which made him feel better. She is also only one of a few people, aside from Miyuki, in the series to verbally express the opinion that Tatsuya is physically attractive, calling him a "hunk" (with Mizuki nodding in agreement with her). Also, Erika later tells Mibu Sayaka that he is more attractive than Kirihara Takeaki. Also, it's implied in Volume 9 chapter 5 that since she met him in April, she was intent on getting stronger.
However, Erika has told herself that she does not want romantic feelings to ruin her friendship with everyone, so it seems Erika holds herself back. Therefore, there are mostly no moments Erika gets jealous with other girls who try to approach Tatsuya. She even makes fun of Tatsuya when those moments come, except one time - when she avoids talking to Tatsuya because:
|“||In the end, we were probably only flirting with Tatsuya. We plainly never requested Tatsuya-kun to 'lend us a hand' and worked under the assumption that even if we didn't say anything, he would still chip in to help. So I was furious ~ when I saw that he was also helping that woman and keeping a foot in either camp.... Damn it, I'm getting embarrassed again.||”|
—Erika confesses to Mizuki, Volume 10, Chapter 8
Erika confirmed that she is interested in Tatsuya, but has been passively waiting for him to make the first move:
|“||"To put it bluntly, Erika-chan, you can’t rely on Tatsuya-kun to take the first step to approach."||”|
—Mizuki confronts Erika regarding her strategy in pursuing Tatsuya, Volume 10, Chapter 8
As a result of the conversation with Mizuki and confirmation that Tatsuya does think of her, Erika resolves to be more proactive in her pursuit.
|“|| Erika adopted a victorious posture before the wide-eyed Mizuki.
"If you have your own thoughts on the matter then so do I, Tatsuya-kun! I will not resign myself to being treated like empty space!"
—Erika declares her resolve, Volume 10, Chapter 8
Tatsuya is also the one who usually cheers Erika up whenever she is upset or feeling down.
It is heavily implied that she knows Tatsuya's identity as a Yotsuba clan member during the Visitor arc, which she stopped digging further upon hearing Tatsuya's advice that it won't do good for either of them to continue talking about it.
In Volume 17, her theory that Tatsuya is part of the Yotsuba, that Miyuki is not his sister, and furthermore they are engaged is confirmed. Since that it took a whole day to overcome the shock, and continue her normal attitude with the Shiba brother.
As stated in Volumes 14 and 17, she does not want to put herself in danger because she knows Miyuki will be angry because of her own feelings for her brother.
Erika is Mikihiko's childhood friend. She often teases him and calls him by the nickname of 'Miki'. She may be strict towards Mikihiko, but she actually cares for him which was shown in the Nine Schools Competiton Chapter, where Erika helped Mikihiko to build his confidence.
Mibu Sayaka was beaten when Blanche attacked First High, but Erika said that she could be proud to force a daughter of the Chiba Family to get serious. After that, she went to see her at the hospital, and they became friends.
|“|| Tatsuya-kun wants me to try and persuade my father, correct? So that the Parasite captured by the Intelligence Department can be returned to Erika-chan and her group."
Though this hardly mattered, at some point Mayumi started to refer to Erika as "Erika-chan", something that would have prompted a highly unwilling look on Erika herself if she were present (Mizuki was allowed to do so, but no one else). Then again, he could never get used to Mikihiko being called "Miki", so this must be what it means by "what goes around, comes around".
……Tatsuya shook his head to dispel the random thoughts and replied with "I didn't ask you guys to return it" in response to Mayumi’s question.
The author dropped a hint through Tatsuya that after the incident happened to Leo, Erika might bias against the Saegusa family due to the way they hid their family member which ruin Erika's brother's investigation.
"That woman" refers to Mari during the Nine Schools Competition Arc, and to Mayumi during the Visitor Arc. Miyuki immediately took the opportunity to tease Erika with being a bro-con, after witnessing the scene where that reference above was uttered.