List of Grimm characters

• Marie Kessler (played by Kate Burton) is a Grimm who is Nick's aunt. She told Nick that she worked as a librarian, but it is unclear whether this was true or she worked as a Grimm full-time.
• Kelly Kessler Burkhardt (played by Mary Elizabeth Mastrantonio) is Nick Burkhardt's mother and is also a Grimm. Her first appearance is in the last episode of season 1 (episode 22).
• Theresa Rubel (played by Jacqueline Toboni) often known as Trubel (pronounced "trouble"), is a vagrant runaway and a Grimm
• Dr. Harper (played by Sharon Sachs) is a medical examiner, who occasionally works on Nick and Hank's cases.
• Bud Wurstner (played by Danny Bruno) is a beaver-like creature, called an Eisbiber, who first encounters Nick when he is repairing his fridge.
• Sergeant Franco (played by Robert Blanche) is a police officer who works in the Homicide Department, apparently under Sergeant Wu. He appears to share many of Wu's duties and possibly fills in for Sergeant Wu whenever the latter is busy elsewhere.
• Catherine Schade (played by Jessica Tuck) is a Hexenbiest and Adalind's mother. She is first seen in episode 17 (season 1, episode 17). She taught Adalind everything she knew about being a Hexenbiest. The last time she spoke to her daughter was episode 17 (season 1, episode 17) when Adalind ingests Nick's blood, removing her Hexenbiest abilities. She was accidentally killed in episode 24 (season 2, episode 2) by Nick's mother when the latter was trying to find a cure for Juliette.
• Eric Renard (played by James Frain) is the brother of Sean Renard. He is fluent in English and French and lives in a Norman-style castle. He first appears in episode 23 (season 2, episode 1) when he is seen approaching a man undergoing torture, demanding the names of people in the resistance. Eric is a recurring character in season 2.
• Sebastien (played by Christian Lagadec) is a lawyer in the service of Eric Renard's royal family. He is an undercover ally of Sean Renard and regularly aids him by providing information regarding the family. Viktor eventually discovers his betrayal and kills him in the episode "The Show Must Go On" (season 3, episode 16).
• Ryan Samuelson (played by Michael Grant Terry) is an intern at the Portland police department who appears to worship Nick. He is later revealed to be finding Wesen using police information, then torturing and killing them, similar to ancient historical Grimms.
• Pilar (played by Bertila Damas) is fluent in Spanish and English, who helps when Juliette loses her memory of Nick. Pilar has not been revealed to be Wesen or a Grimm, but she can identify that Juliette is cursed.
• Stefania Vaduva Popescu (played by Shohreh Aghdashloo) is a Zigeverisprathes or Queen of Schwartzwald Roma at the House of Kronenberg. She helps Adalind get her Wesen powers back. She is a rival of Frau Pech.
• Frau Pech (played by Mary McDonald-Lewis) is a Hexenbiest who, at the cost of her life, helps Adalind recover her Hexenbiest powers.
• Baron Samedi (played by Reg E. Cathey) is a Cracher-Mortel, a Wesen who works with Eric Renard. He arrives in Portland at the end of season 2 and turns several people into zombie-like creatures as a cover-up for the abduction of Nick.
• Viktor Albert Wilhelm George Beckendorf (played by Alexis Denisof) is a second cousin of Eric and Sean Renard who becomes the new Crown Prince after Eric's death.
• Alexander (played by Spencer Conway) a Wesen who works for the Wesen Council. He comes to Portland three different times. In the episode "Once We Were Gods," he asks Nick to stop someone from stealing an old mummy.
• Martin Meisner (played by Damien Puckler) is a human member of the resistance. While not a Grimm, Meisner can identify Wesen on sight and is familiar with the different types of Wesen, as well as their strengths and weaknesses.
• Diana Schade-Renard (played by Isley and Aria Zamora in season 3, Sloane McGinnis in season 4, and Hannah R. Loyd in seasons 5 and 6) is the daughter of Adalind Schade and Sean Renard. She is also the older half-sister of Kelly Schade-Burkhardt. She displays powers of telekinesis, pyrokinesis, casting illusions, and precognition.
• Josh Porter (played by Lucas Near-Verbrugghe) is the non-Grimm son of Roland "Rolek" Porter. Rolek Porter, who was a Grimm, died in episode 65 (season 3, episode 21). After his father's death, Josh is tasked with giving Nick the Grimm tools and books owned by Roland, including one of the seven map keys.
• Elizabeth Lascelles (played by Louise Lombard) is Sean Renard's mother and is also a Hexenbiest. Elizabeth had an affair with King Frederick, which resulted in Sean's birth.
• Henrietta (played by Garcelle Beauvais) is a Hexenbiest and old friend of Elizabeth Lascelles and Sean Renard, being one of the reasons they come to Portland. Sean sends Juliette to Henrietta to help her deal with her new Hexenbiest powers. She is killed by Sean Renard while he is under the influence of Jack the Ripper.
• Kelly Burkhardt (played by Owynn and Quinn Ingersoll, Emma and Claire Dezellem, and 2+ other sets of unknown twins in season 5) is the son of Adalind Schade and Nick Burkhardt, named after Nick's recently deceased mother Kelly Burkhardt. He is also the younger half-brother of Diana Schade-Renard.
• Andrew Dixon is a candidate running for mayor of Portland. His first appearance in the series is the season 5 episode "Wesen Nacht".
• Conrad Bonaparte (played by Shaun Toub) is a powerful Zauberbiest and a co-founder of Black Claw who first appeared in the episode "The Taming of the Wu". He has significant involvement in Black Claw's manipulative plans.

The show refers to its numerous creatures as Wesen, which is German for creature or nature. While the species of each creature often has a German name, although disregarding correct spelling or grammatical, most of the Wesen in the series do not exist by these names in Grimms' Fairy Tales. Some creatures have different names in the German synchronization of the series. For example, the Fuchsbau ("fox den") are called fuchsteufel ("fox-devil") in the German translation of the series.

Wesen are theriomorphic humans with certain traits and abilities characteristic in animals or mythological creatures. The non-human traits and abilities appear when Wesen are aggressive or otherwise emotionally agitated, which is referred to as wogeing from the German wogen, meaning surge. According to the character Monroe, normal people can see only the human appearance of a Wesen, not the woged form. However, Wesen can allow themselves to be seen, which is the source of legends and stories passed down as fairy tales by The Brothers Grimm.

The Wesen community has its politics and institutions, led by the Wesen Council which has the functions of judiciary and legislature. Separately, the seven Royal Houses in Europe are aware of the Wesen community in the series and are vying to restore their former influence in the world. There are also the German: Verrat ("betrayal"), a secret police of Wesen working for the Royal Houses to manipulate others in the Wesen community; the Laufer, a Wesen resistance movement against the Royal Houses; and the reapers, assassins mainly concerned with eliminating Grimms. It is never clearly stated in the series whether members of the Royal families are Wesen themselves; however Wesen–Royal romantic relationships are frowned upon.

• Grimm, Universal Television et al., 2011–2014.