Yuzuki Katagiri is a 10-year-old girl, with messy, dirty blond hair pulled into high pigtails, with bangs, split in the middle and has brown eyes. She also wears a choker and a leather-made vest.
Yuzuki shares the same attitude as her brother, being a hotheaded and brash individual. She has a tendency to call Rentaro a pervert in any given situation, but reasons for this are unknown. She is shown to be overconfident in her abilities, such as seen with Tina Sprout, believing she could easily defeat her, but the latter beat her without any difficulty. Aside from this, she later puts out that she is weak and would be a bother if she was part of their team, but after Tina reassures her and told her that she was amazed at her skills in keeping a former rank 98 on the defence, Yuzuki jumps in joy, showing her side of affection. She considers Tina to be a really strong and cool person, going as far in saying she loves her, albeit platonic, and to marry her. She shows her playful side when she joins in with Enju to strip Fuse's underwear and dress, to check whether Fuse grows a tail or not. 
Third Kanto War arc
When Rentaro brought Tina to Katagiri Civil Security Corporation office, she greeted Rentaro rudely and constantly calls him a pervert. When they found out from Rentaro that the Monolith will break down in four days, and found out that there are 2,000 Gastrea outside of the Monolith, they attempted to send both of them out. Rentaro tries to reason with them to join the adjuvant. It ends out that a fight between Rentaro and Tina, and the Katagiri brother and sister, has to be done in order to decide whether the Katagiri brother and sister are to join the adjuvant or not. After losing the fight, they decided to join the adjuvant.
Initiator (イニシエーター Inishiētā): Controlling the Gastrea blood in her body, Yuzuki gained superhuman abilities. She is a Model Spider Initiator.
Spider Web: Yuzuki has the ability to release a very thin spider web string from her fingertip, which is invisible to the naked eye, unless shown by light, but Tamaki is able to see them through use of his special sunglasses. These webs can stick to several surfaces and can spread distances. However, it is unclear on the strength of the webs since they are mostly used to trap their opponent.
- Initiator's Ability: Agility: Yuzuki has displayed her agility and jumping abilities in their mock battle between Rentaro and Tina, jumping from the floor to the roof of the place they were fighting and moving in other places. She is very quick on her feet when jumping, calculating her distances very quickly, and use such agility to trap Tina in her web.
- Initiator's Ability: Recovery: Being an Initiator, Yuzuki possess the ability to recover quickly from injuries like all the other Initiators.
Tina Sprout is a fellow Initiator and friend of Yuzuki. Yuzuki seems to have strong respect for Tina, much to the fact she was surprised upon her former 98 IP rank.
Although not exactly friends, both Rentaro and Yuzuki seem to know each other to a certain extent, having served on the same mission to hunt down Kagetane Hiruko. She either hates him, lacks trust in him, or may hate him. She constantly calls him a pervert instead of his actual name. However, despite this, she seems to trust him as a leader respect and willing to follow his decision. Following the ending of the war, she showed concern for Rentaro due to his injury, after Shouma's death, to which left him devastated.
Takami is Yuzuki's older brother, as well her Promotor. Although not much is known about the two, the two treat each other almost as normal siblings, regardless of her Cursed Child status. Both share a similarity in terms of personality, being both rude and hotheaded.
|Initiators||Enju Aihara • Tina Sprout • Yuzuki Katagiri • Asaka Mibu • Yulia Kochenkova|
|Deceased||Kayo Senju • Midori Fuse• Hotaru Kouro|
|Male||Rentaro Satomi • Kikunojō Tendo • Sōgen Saitake • Tamaki Katagiri • Sogen Saitake|
|Female||Enju Aihara • Kisara Tendo • Seitenshi • Tina Sprout • Yuzuki Katagiri • Asaka Mibu • Miori Shiba|
|Left||Kagetane Hiruko • Kohina Hiruko|
|Deceased||Shougen Ikuma • Kayo Senju • Midori Fuse • Shouma Nagisawa|