Hikinige Kaba

AKA Hit-and-run Hippopotamus, is/was the Messenger of Tamiko Shinomiya (Anime) and Midori Kuzuhara (Manga). Unfortunately unlike the other Messengers, it had not been in the manga nor the Anime much, and only briefly physically in appearence in the Manga which is not the case for the Anime. When it's companion died, it ceased to be a messenger.