*Rumi is the protagonist of KPop Demon Hunters. She is the leader and main vocalist of the famous KPop girl group HUNTR/X, which also consists of her friends Mira and Zoey. She is a charismatic idol in the spotlight and a fierce fighter on the battlefield, Rumi and her groupmates assume secret identities as demon hunters to protect humanity.

She is voiced by Arden Cho, her singing voice is provided by EJAE, and her younger self is voiced by Rumi Oak.

Rumi is kind-hearted and ambitious, working hard to achieve her goals while also taking time to care for her friends and fans. Raised to be an idol, she displays herself to be charismatic, confident and friendly. She outwardly shows appreciation for her loved ones and wishes to protect them from harm. As the leader of HUNTR/X, Rumi is used to being the responsible one in the group.

Her ambition is especially emphasized with her long-time goal and duty to seal the Golden Honmoon, which will permanently banish the threat of demons in the world. However, Rumi's determination can result in her being isolated and so focused she refuses to relax, as stated by Mira. She is also shown to push herself, such as when she persists to go on with the Idol Awards despite her voice audibly faltering.

Hidden under her optimistic demeanor, Rumi harbors a deep insecurity of her demon heritage, likely due to her beliefs as a hunter. She fears the thought of it being revealed, and thus constantly tries to cover her body patterns. However, her desperate attempts to keep this unknown make her become more distant and unreasonable toward her friends. She becomes secretive, uptight and unwilling to open up about her feelings, causing problems amongst the group and breaking the trust between them.

Also due to being part demon, Rumi is the most sympathetic towards them out of the trio. This is further imposed upon her after forming a friendship with Jinu, a demon who explains his past to her. This results in Rumi carrying the new belief that not all demons may be completely evil, and some may be forcefully trapped under Gwi-Ma's control. While the song is in development, Rumi considers changing the lyrics in "Takedown" to be less hateful, which gets her questioned by her groupmates.

Rumi is a fair-skinned young woman with a slim figure. She has long, calf-length bright purple hair styled into a braid starting from her hairline going down the back of her head. She has dark brown upturned eyes framed by long black lashes. Her arms are covered in her demon markings resembling loose purple stripes, which are usually hidden from view. The longer she hides her shame, the bigger the markings spread, until eventually at the finale, they reach her face.

Demon In her revealed demon form, Rumi's appearance has bright demonic features. Her braid is messier with numerous loose strands, and her left eye becomes a bright orange-yellow that temporarily glows. The most noticeable changes are on her limbs. Her demon patterns spread onto her face and legs as well, glowing a bright pink, or rainbow in some areas. Rumi's right fingernails transform into sharp claws, with a dark hue over her hand.*