Arika Okoze is a supporting character in the series Ao no Kanata no Four Rhythm. A lively, overconfident, and vigorous girl who is Mashiro's childhood friend and rival. She's a first-year student at Shitou Suisan. Arika really likes tuna thats why she is sometimes called 'Maguro-chan'.
- She admires Mayu greatly, who calls her also "milady".
- Arika always seems to be overexcited, but when she is with Mayu she always try to be nice because she don't want her senpai to be mad at her, like at the Summer tournament, when she was looking at her match opponent but then she saw Mashiro Arisaka FC team and walked towards them and greeted Mashiro. Misaki is greeting her with "Maguro-chan" which made Arika angry and was yelling at Misaki at that moment Mayu heard that and she wanted to punish Arika, Arika begged forgiveness.
- If Mayu touches her face, or pats her head, she blushes timidly.