Over the course of the series, Haru has worn many different outfits varying in design and culture. The ones known are listed below.
Haru's namahage costume. It was first seen during the Daily Life Arc. Haru likes the costume Namahage and is seen wearing it most of the time.
Haru's knight costume. It was first seen during the Daily Life Arc when she was chasing Tsuna.
Haru's kimono costume. It was first seen during the Daily Life Arc when it was New Year's Day and Reborn gathered Tsuna's Guardians at the time (Gokudera, Yamamoto, Ryohei) to compete against Dino's Chiavarone Famiglia.
Haru's Dangerous Interview costume. It was first seen during the debut of Haru Haru's Interview: Dangerous. She is seen as a chibi.
Haru's Namimori Middle Disciplinary Committee costume. She has a regent hairstyle, as well as the uniform.
Haru's choice arc suit; worn when the spectors were watching the fight between the Vongola and Millefiore.
Haru's bikini outfit.
Haru's mole costume. It was first seen when Haru, plus Lambo and I-Pin were in mole costumes to help Tsuna and the gang look for the school time capsule.