Onigiri (Japanese rice balls) are Okayu's favorite food, and are used as her fan mark. According to her lore, Okayu is a cat adopted and raised by her grandmother who runs an onigiri shop.[1]
Feast, Mogu Mogu, and Yummy all reference Okayu's first original song MOGU MOGU YUMMY!, which depicts Okayu as a glutton who's willing to eat anything at any situation.
Mogu Mogu (もぐもぐ) is the Japanese onomatopoeia for chewing.
Sensitive Voice's name is a reference to Okayu's deep, calm, and husky voice, which is especially appealing to listeners of all genders.[2] Its effect is a reference to Okayu's reputation as a harem protagonist among hololive members.[3]
Before joining hololive, Okayu actually disliked her own voice due to it being difficult to hear. According to her, it is especially inaudible in karaoke in contrast to a higher-pitched voice, but also when collabing, her audio sounds really quiet to the others and needs to be turned up quite a bit.[4]