What the game itself says
Everything official comes from the Roblox listing; the behavioral detail below is community-documented.
The official description (checked 2026-10-08) states: “The Emotion Prison has been taken over by Corrupted Emotians” and asks players to “Cleanse the Corrupted Emotians and bring peace to the Emotion Prison”. It also warns: “Do not let their adorable looks fool you - You will soon be faced with deadlier and darker threats.”
The September 23, 2026 update text even framed the new character around them: “How will Pepper take on the Emovils in the world of Emotia?” — official confirmation that Emovil is the game's own name for these corrupted entities.