Haruka Itsumura attends Suzumura Girls' Junior High School as a second-year student. She has long blonde hair styled in low twin-tails held by white scrunchies, featuring choppy eye-length bangs and messy mid-neck forelocks, complemented by deep blue eyes and a small pointed cowlick. Her appearance often echoes Yukari Itsumura's style and coloring. Her specific idol unit outfit includes lace sleeves with red bracelets, a black miniature top hat adorned with a red gingham ribbon matching her tie, plain black stockings featuring two rings on the left thigh, and white-and-black shoes with gingham cuffs.

Haruka exhibits a calm and reliable personality. She demonstrates a strong aptitude for synchronization in singing and dancing, coupled with extremely high technical proficiency in both. She enjoys sewing and cookies, but dislikes high places. She maintains an unusual familial relationship as the niece of Yukari Itsumura, despite being one year older and slightly taller than her aunt. This relationship includes practical daily interactions, such as Haruka tying Yukari's hair due to Yukari's dislike of the task.

Haruka performs alongside Yukari in the idol unit Ortensia, with her designated theme color Ortensia Purple (#DE98CE). She lived with her parents until their work required relocation abroad. When her parents transferred overseas, Haruka decided to accompany them. This decision precipitated Ortensia's final live performance together before her departure. Her name, Haruka, reflects "sunshine" (陽) and "flower" (花), while her surname Itsumura combines "that one" (伊), "ferry" (津), and "village" (村).