When attacking, this Yo-kai ignores the foe's good inspirits.
When receiving favorite food:"Whis, whis, whis!"
When being befriended"You weren't very good, whis! Won't my friendship become encouraging, whis?"
Josper is a portmanteau of Whisper and "Joker", as in the playing card.
Josper's design is based on the black Joker in French suits. The name "Whisbaba" refers to baba-nuki (ババ抜き), a Japanese variant of the card game "Old Maid" where instead of adding/removing a card to create an unmatchable one, one joker card is added.