It's been a while so memory is hazy.
This does sound like dominant Te.
Ah, you said you didn't see Si. IMO, this is Si<->Ne dichotomy: stability over the unknown [possibilities].
Nope. Sera fears deprivation [nothingness] because she's a glutton: freedom, autonomy, the ability to experience new and wonderful things ~ viva la revolucion! She doesn't play nice with people because that would require compromise and abiding by spoken and unspoken rules of the game - antithesis to freedom. There's also an aversion to sadness and reflection (giving the past some thought), hence her fear of the fade - the realm & spirits representing the past, reflection, introspection. Cassandra fears helplessness because of her sense of duty [superego], strong expectations set for herself.
They are both similar in that both have a strong sense of autonomy and both are tied to one another in terms of health and growth. Sera can use the discipline and focus and grand sense of duty [vision] for what she wants, rather than participating in petty revenge schemes, akin to spray painting graffiti on a building and calling it revolution (weak Te). Cassandra can use a bit of spontaneity and indulgence so as to lower her blood pressure and live to a decent age. I think Cassandra's tarot card (romance variant) symbolizes her path to growth - spilling of the chalice representing caution to the wind, passion & excess.
She could be. I thought she was too willing to play the game to be TJ. Her attention to affiliations and unspoken social dynamics, while representative of her work, is too tedious for TJs.
You could be right for the ISFP alternative...or she could be an ISFJ. Didn't see Ni in her.
