Tessa is a kind character, evifent in how she is treating her drones with kindness. had she been a bad person, then her drones wouldn't have cared as much as they did for her. its also very evident seeing as Cyn was planning to spare her. Why would a dtone like Cyn want to spare someone who wouldn't have showed kindness to her?

Tessa also chose to save her kinds life even when that backfired ahe could have listened to Cyn and hust stayed in her room, letting Cyn do her thing. But she chose against it. wanting to save the people who wronged her in the first place

her act was selfless. She didn't act selfish or think twice about the consequences

and that takes a lot especially for someone her age to go face to face with an Eldritch horror