Rosalee (Bree Turner) is now a permanent character on "Grimm." This new character brings some light and relief to balance the darker side of the series. Rosalee additionally brings an intellectual aspect to the show that pairs well with Monroe's (Silas Weir Mitchell) humorous intellect. Her presence may also welcome some new possibilities.
A softer side
Rosalee is the friendliest character on "Grimm." With all of the gruesome death, evil intent, and darkness from the bad Wesen of "Grimm," Rosalee brings a much needed lightness and sweet demeanor. She's a fox-like Fuchsbau who can be sly when need be, and kind the rest of the time.
An intellectual side
As an apothecary for the Wesen (creature) world, Rosalee knows all of the potions and elixirs needed to cure what ails the various creatures. Her knowledge adds more to the "Grimm" mythology, explaining some of the inner workings of the Wesen and how various substances will affect them.
More interest for Monroe's character
Monroe has always been an intriguing character, but he was just a sidekick to Nick (David Giuntoli). The only time viewers got to see Monroe's private life was when it either added humor to the situation, or corresponded with what was going on in an episode. With Rosalee at his side, perhaps viewers will get to see more of his private life, especially if they officially become a couple.
In addition, Monroe has always provided Nick with most of the information he needed to fight the Wesen. But it wouldn't have made sense for Monroe to know everything there was to know about all Wesen. Rosalee helps to fill that gap.
The possibility for emotional distress
Emotional distress is a wonderful tool in TV, because it allows viewers to see what a character is really made of. Now that Monroe and Rosalee have an emotional connection, distress will come when either one of them is in danger.
If Monroe or Rosalee are placed under emotional stress, viewers will have the chance to see how deep their feelings run for each other, and what lengths they would go to in order to save one another. These situations develop characters far beyond the slow bits of character development obtained during the normal course of the show.
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