You may have to do a certain quest with that character. It should also have a blue flag near its name.
I there's nothing like this then... I don't know.
You often have to trigger some scene to advance the story.
For the bath thing, it's a good idea. I read on the manual that it's strengthening characters. But there is something else and it could be this. Didn't check properly.
You are not allowed to request a sticky.