I did not know who they were, but after checking I have to agree. I would have to obtain permission before I put it in there since I can not assume to distribute other's copyrighted material. I would not want the site admins to be hammered with take down notices.

I saw something interesting, have the mage fire the fireball, then have both players turn on their shields, the fireball will go back and forth faster and faster and eventually the ninja will get blasted off of the screen.

You can bundle a specific font and set its size in your scenario, so you will no longer be t the mercy of the user's installed fonts.