The "Marshmaro" characters are visible to us, but not to the people in the BonKoi world. They come in various forms, with various personalities. The scripts call them "Maro (type)." In this episode, Sayuri, Ryou, Mitsuki, Gilbert, and Yoshinosuke have been taken over by the Marshmaros. Enjoy a BonKoi that's a bit different from the usual!
The only French I've ever had is French toast, maro!
!الأكل الفرنسيّ الوحيد الذي تناولته كان الخبر المحمّص الفرنسيّ-مارو
Das einzig Französische, was ich
bisher hatte, ist French Toast, maro!
¡Lo único francés que he comido 
es una tostada francesa, maro!
¡Lo único francés que he probado
son las tostadas francesas, maro!
Moi qui n’ai jamais mangé
que du pain perdu, mallow !
Única coisa que já comi
 disso é pão francês!