Katja

Katja is kind, quiet, polite, and noticeably melancholic. She has endured the loss of several people close to her, leaving her detached about her own future even though she remains deeply concerned about the safety of others.

She treats her Celestial Spirits as companions rather than expendable tools. When danger approaches, Katja worries about whether they are frightened or hurt instead of simply ordering them to continue fighting.

Katja is also sensitive about her appearance and briefly misunderstands Doranbolt's awkward behavior when he realizes how strongly she reminds him of someone from his past.

Katja is trained in Celestial Spirit Magic and possesses Silver Keys that open gates to spirits including Nikora and Caelum.

She is capable of Multiple Summoning, keeping two Silver Key spirits manifested simultaneously with enough ease to surprise Doranbolt.

Her inherited Organic Link is not an offensive technique. Instead, it forms part of the magical system established by Will Neville and his disciples to prevent the Infinity Clock from being fully activated.

Katja comes to the attention of Lahar and Doranbolt during their investigation into the descendants of Will Neville's disciples.

Doranbolt meets her at a cathedral and is struck by her resemblance to Wendy Marvell. Their conversation also touches on events from seven years earlier and the people Doranbolt believes he failed to save.

Racer arrives to target the Organic Link Katja carries. Doranbolt intercepts his attack while Katja attempts to escape.

Anti-Link removes Katja's inherited connection to the Infinity Clock and, as a consequence, strips away her ability to use Celestial Spirit Magic. She later watches Lucy's attempt to free the Celestial Spirit Mages affected by the same process.

Will Neville created the system inherited through Katja's ancestor.

Doranbolt protects Katja from Racer and is reminded of Wendy when he meets her.

Lahar accompanies Doranbolt during the investigation into Katja's Organic Link.

Racer targets Katja as part of the Reborn Oración Seis operation.

Caelum is one of Katja's contracted Celestial Spirits.

Wendy Marvell is not personally close to Katja but is repeatedly invoked because of their striking resemblance.

Lucy Heartfilia later helps address the effects of Anti-Link on the targeted Celestial Spirit Mages.