Harū Kido possesses spiky red hair, green eyes, and a distinct wardrobe featuring a fiery orange and yellow jacket over a red and white long-sleeved shirt, white pants, red boots, and a dark green choker, creating a striking appearance aligned with his older brother persona.

Consistently optimistic and approachable, Harū exhibits a supportive demeanor marked by a bright smile. He readily shares techniques and strategies with less experienced individuals, enabling him to recognize positive qualities in others. This fosters deep respect and admiration, solidifying his role as an older brother figure among peers.

Holding the title of three-time consecutive champion at the BakuTech Colisseo, he is also known as "Haro Dodgy" or "King Harou." His influence inspires younger characters to engage with Bakugan. In the anime, Harū first appears in the nineteenth episode, providing fundamental Bakugan instruction and earning the affectionate address "Harou-nii" (Big Brother Haro) from those he mentors. His guidance includes insights on Power Battles. Within the manga continuity, his foundational role in motivating younger characters remains consistent.

His primary Bakugan partner is the fiery Pyrus G-Ganorada. Harū's battle record includes a tag-team victory alongside Albino against Rio and Yuma. He later intentionally loses a match against Harubaru Hinode to assess and encourage the latter's growth. His signature 'Bending Shoot' technique is renowned for its overwhelming power.

The etymology of his name translates to "Supreme Phoenix" (覇凰, Harou) and "Wooden Door" (木戸, Kido), with the given name complementing his partner Bakugan's thematic elements.