Tachibana Hibiki is a high school student who survived a catastrophic Noise attack at a Zwei Wing concert, witnessing the death of idol Kanade Amō. A fragment of Kanade’s Symphogear relic, Gungnir, embedded itself in Hibiki’s chest, granting her the ability to wield the armor two years later. The relic initially caused physical strain as fragments spread through her body during transformations, risking fatal consequences. This condition was resolved when a laser from Miku Kohinata’s gear excised the fragments, temporarily disabling her transformation until she reignited it using energy from Maria Cadenzavna Eve’s Gungnir during a pivotal battle.

Her combat style blends martial arts with piston or jet-powered gauntlets for close-range engagements. Key techniques include the Hibiki Style Spear Thrusting Strike, channeling concentrated energy into single targets, and S2CA Tri Burst, harmonizing her phonic gain with allies to neutralize backlash. Over time, she unlocked the X-Drive form, requiring global phonic gain, and the Amalgam transformation, amplifying power at the cost of durability. Exposure to the Shénshòujìng’s laser purged the Curse of Balal, enabling her to function as a “God Slayer” capable of destroying divine weapons.

Hibiki embodies relentless optimism and compassion, prioritizing dialogue over violence to resolve conflicts. This conviction drives her to physically intervene in crises, rooted in Kanade’s sacrifice and a refusal to accept passive death. Despite her cheerfulness, she harbors guilt over past failures to protect others, stemming from childhood bullying endured after surviving the Noise attack. Her bond with Miku Kohinata anchors her emotionally, reflected in their shared songs and combat motifs.

Across media, her growth includes mastering Gungnir’s forms like the Ignite Module, which risks berserk states if mismanaged. Spin-offs such as *Symphogear XD UNLIMITED* showcase exclusive techniques like Hibiki Style Phoenix’s Pair Swallow Opposition and Lightning Missile, emphasizing adaptive combat strategies. These iterations reinforce her role as a bridge between factions, leveraging her Symphogear’s resonance to unite allies and adversaries.

Her arc concludes with surviving a mission to destroy a section of the moon to protect Earth, initially presumed fatal. Post-recovery, she balances Symphogear duties with personal relationships, embodying themes of perseverance and interconnectedness central to her character.