Bianca from Dragon Quest V: Hand of the Heavenly Bride is going to visit the world Dragon Quest IX: Sentinels of the Starry Skies via a content download. Players with the Japanese version will be able to add her as a guest character to Rikka’s Inn.
There’s another Dragon Quest crossover guest, but this one isn’t friendly. Orogodemir from Dragon Quest VII is in the game as a bonus boss. Beat it and you could get a mini medal or blue orb.
The Orogodemir battle is acquired from a Dragon Quest Monster Battle Road II arcade machine, which we don’t have in North America. It’s unclear how we’ll get this content in the States when Nintendo, not Square Enix, publishes Dragon Quest IX in the West this summer.