Any characters of your choosing! Any style you want, it's not limited to my own!
Here are some examples of completed YCH's:
Flirty YCH: http://www.furaffinity.net/view/24683456/
Flying YCH: http://fav.me/dbpkk0z
And here are some YCH's that are still open!
Tickling YCH: http://www.furaffinity.net/view/25254364/
Flying YCH: http://www.furaffinity.net/view/24983354/
Flirty YCH: http://www.furaffinity.net/view/24665939/