Hibiki Tōdō performs as a member of the idol group Callings alongside Shou and Wataru. His younger sister Kanon Tōdō occasionally clashes with Rizumu Amamiya due to their sibling rivalry. Though publicly regarded as a natural talent, he secretly trains in a practice spot known exclusively to Rizumu, highlighting his disciplined dedication beneath his effortless image.

He maintains a calm, passive demeanor that balances Shou’s fiery energy and Wataru’s playfulness. Romantically inclined toward Rizumu, he often flirts to elicit her blushing reactions. During Prism Shows, his focus shifts to intense professionalism. He demonstrates protective concern for Kanon but grows visibly exasperated during disputes between her and Rizumu.

His appearance transforms across the timeline: early depictions show short navy-blue hair and light-brown eyes, while three years later, his hair lengthens into a messier style.

His relationship with Rizumu evolves from backstage interactions to a committed romantic partnership by the initial series’ end. Three years afterward, they marry privately, immediately informing Kanon while concealing it publicly for career reasons. After roughly 1.5 years, they pursue official disclosure, encountering initial resistance over timing. Following peer and management support, their marriage becomes public, culminating in a formal wedding ceremony. They later enjoy a honeymoon observed by Rizumu’s family.

Through marriage, he becomes son-in-law to Ryutaro and Sonata Amamiya and brother-in-law to Kaname Amamiya and an unnamed sister.