Opoona

Opoona (オプーナ, Opūna) is the titular protagonist of Opoona. He is one of the playable characters in Musou ☆ Stars.

Development
Furusawa stated that Opoona wasn't initially considered to become a playable character in Musou Stars, but he came up while the developers were cycling through potential Koei IPs to feature. The team wanted to sneak him in somehow so they included his silhouette in the game's first teaser movie. Kou Shibusawa's comment at 2016 PlayStation Press Conference in Japan ("I want to use the Energy Bon Bon.") and excited fan reaction sealed the team's decision to make Opoona playable.