Remon Natsume is a second-year student in Class B at St. Lulim's Girls' School. She sports matcha green hair styled in two buns, chestnut brown eyes behind glasses, and wears the standard Lulim Academy uniform with knee-high socks and ribbon accessories.

Her personality is upbeat, energetic, and earnest, marked by strong loyalty to Lulim Academy and its student council president, Chikaru Minamoto. She actively defends Chikaru's reputation and expresses frustration when others like Shizuma Hanazono or Amane Ōtori receive more attention. While generally cheerful, Remon becomes shy when flustered by direct questions about her feelings. She shows keen interest in romantic matters, visibly excited by topics like attraction and relationships.

Remon participates in multiple clubs led by Chikaru Minamoto: the Transformation Club, the Secret Club, and the Waiting First in Line Club. During Transformation Club activities, she engages in cosplay, such as wearing a prince outfit alongside Kizuna Hyūga dressed as a princess.

Kizuna Hyūga is her closest friend, and the pair are consistently seen together. Their relationship carries romantic undertones, demonstrated through shared activities and subtle emotional cues. Remon objects possessively when Kagome Byakudan attempts to sleep between them during summer school. She further highlights this connection by immediately volunteering to play Juliet after Kizuna secures the role of Romeo in a cultural festival play.

Her admiration for Chikaru Minamoto causes her to blush when questioned about her feelings. She also expresses enthusiasm for Amane Ōtori, describing her as "cool, dashing, and gallant," though clarifies this is admiration rather than romantic interest when prompted. Remon enjoys teasing others, such as Tsubomi Okuwaka about Tsubomi's admiration for Hikari Konohana.