Cologne is Shampoo's great grandmother.  She is about 400 years old.  Don't let her age fool you however.  She knows a lot about fighting.  She would very much like Ranma to marry Shampoo.  She wants Ryoga to defeat Ranma and win Akane's love so that Ranma will have to marry Shampoo.  She has tought both Ranma and Ryoga some amazon tricks

This character is counted as a boss