Mortimer is very similar to Professor Ratigan that those are Disney Villains
- They both are rats.
- They both have mice archenemies (Mickey Mouse for Mortimer's case, and Basil for Ratigan's case).
- When they both always meet with their rival, they both would defeat to them, and they both took something what their enemies' have (Mickey's button for Mortimer's case, and Basil's moustache for Ratigan's case), and finally they both laughed at their enemies that they both have won (Minnie's affection for Morimer's case, and knowledge for Ratigan's case).
- They both voiced by Maurice LaMarche for current version.
- Unlike Ratigan, Mortimer had never sidekick, and he is thin.