As Sabrina Grimm is the main protagonist of The Sisters Grimm series, her interaction with other characters reveal relationships between herself and them much more easily. Mr. Canis is another character who is as complex as Sabrina, with two different personalities crammed into the body of a frail old man, as well as a past that is completely foreign to him . His struggles to overcome his inner beast, coincide with Sabrina's struggles to become a better person.