Background NPC to become PC, Suggestions needed Options

[Talia Invierno]

An NPC background, backstory character is about to become a PC. The player who will be playing her is new to that campaign, but very familiar with the SR system and with roleplaying generally.

The premise is that of an old "true love" of one of the existing, continuing (mage) characters ... who just happens to be a "psychic vampire" (not HMHVV, but a type of continual low-level Stun area effect that kills plants and prevents the wounds of others from healing). Beyond that:

• Number of bp doesn't really matter too much (although probably, practically, it shouldn't go much above a 3rd or 4th level initiate who achieved that rank in-play). Regardless of the level, the player will be able to play her as balanced with the rest of the characters.
  
• She belongs and is utterly faithful to the cult left by the PC. (This hasn't been particularly fleshed out ... yet, except insofar as it is not a bug spirit cult.) They want him back.
  
• She equally loves the PC, and would give up her life to save his.
  
• Direct magic known to be possessed by the character should be at most spell defense (instinctive) and maybe astral sight. This doesn't mean that this is all the magic she could potentially possess!
  
• A previous memory wipe is definitely a possibility.

Suggestions as to what should we make that character? (This doesn't need to be limited to [meta]human, nor even to bug spirits.) Unusual concepts especially welcome!

Help?