I actually liked Ayane in Dimensions, easier to use and her English VA was better, she voices Lisa in DOA5 now. XD plus her parts in the chronicle mode were awesome
Ayane is at her best in the ninja gaiden games tbh. I wouldn't like her nearly as much if she appeared only on DOA. Did you know that she gives an entire speech about how weak you are when you go on easy mode on the first ninja gaiden?
I didn't know that but I did know that she did kinda run the ninja dog mode in NG Black if you left the harder path of a ninja xD She'd leave you clues and stuff to make the game easier
In Ninja Gaiden 1 (and black and sigma), if you die 5 times on the first stage, you get the option to go to ninja dog, she then will make a speech about how weak you are and how she is going to help you from now on, she will give you accessories and items that will make the game way easier, on normal and above, she is basically just a guide.
Though she is 14 in that game, she was able to survive and escape from Doku, that is a greater fiend, at 15 years old, in Ninja Gaiden sigma 2, she was able to kill a greater fiend that was being powered up by the dragon eye, and in NG3RE (that is unclear on the timeline, but possibly after doa5), she did a lot of things, including killing 3 prototypes of a goddess.