The shogun dragon’s description states that he will “perform harakiri without hesitation!”
Harakiri is a method of suicide more commonly known as seppuku.
Shouldn’t that description be changed?

That dragon is so old and so useless I doubt anyone bother so look at his description or uses him. However if it bothers you that much, perhaps you should send in a comment to support via the in game system. Perhaps they would consider changing it.