That is supposed to happen. When the health-bar is at 33% your pet will faint, and then it needs medicine. When the health-bar is completely empty, your pet will run away.

We already have a few places where you can see and read about famous people of the Harry Potter stories, like the lexicon, the library or the wizard cards.

We can just agree to what the other persons have already said. If you don't like the colour of the librarians, you don't have to become one. The colour can be seen very well and makes it easy to identify the librarians among other users.