She is awakened during the opening events of the game by Kafka and Silverwolf, who leave her to be found by March 7th and Dan Hang on the Herta Space Station during the antimatter Legion's invasion. 

The Trailblazer consistently upholds a composed and impartial demeanor, yet occasionally interjects with irrelevant or humorous remarks, even in the face of serious situations. It is implied through March 7th's memories that they don't talk much.

Furthermore, the Trailblazer demonstrates a keen inclination for exploration, actively seeking interaction with a diverse range of objects. This often results in perplexed reactions from their fellow teammates or nearby outsiders. These idiosyncratic behaviors include aimless wandering, an inclination to inspect trash cans, or even pranks.

When embroiled in combat, however, the Trailblazer's personality undergoes a notable transformation, revealing an intense and ferocious disposition. It has been noted through their ultimate animations that Caelus (male) seems to have a more aggressive outward demeanor in battle, while Stelle (female) seems to be colder and more stoic.

Voice: Medium to deep pitch. Open to and encourage your own interpretations for a voice for her, but also open to voice matching her japanese voice by Ishikawa Yui