I doubt they'd make a yandere LI... would be funny though, cheat on her or be a too friendly with another woman and you get a "if i can't have you, no one can" speech and then bam, Game Over screen.. the Inquisition failed and Thedas is overrun by demons, all because the Inquisitor couldn't keep it in his pants..
But yeah, Yandere may be a bit too much... wouldn't mind her being the jealous and/or clingy type though, since she's an adviser and won't be with the Inquisitor 24/7 she may start to question the Inquisitor about his relationships with the other females of the Inquisition and may even feel a little threatened by a few of the more prominent women of Thedas.. such as Celene I, if the Inquisitor gets to meet her.
The thought of Scribbles getting all bent out of shape because she's jealous...so cute~ 