Looks like the missing Monster Musume support character will finally get her chance to shine in the anime. Volume 11 of Okayado's manga, set to be released in JApan on November 12th, 2016, will feature a bonus OAD packaged with its limited edition. Content matches the description of the manga's swimsuit chapter, #17. In it, Cerea, Miia and Mero decide their need to lose weight after being stuck in the house all day. The trio address the issue by joining Sports Club Kobold, managed by dog-like Polt.
Despite the story being left out, by popular and series' creator Okayado demand, Polt was snuck into a trio of cameos in episode 10, with the character being voiced, at least at the time, by Shiina Natsukawa (Aldnoah.Zero's Lemrina Vers Allusia, Classroom Crisis' Aki Kaminagaya, Celestial Method's Nonoka Komiya).