Terrormisu is an ancient demon who surpasses Count Cannoli as the main antagonist of Wario: Master of Disguise and is also the game's final boss.
Long ago, a powerful and rich pharaoh by the name of Poobah desired to have one wish granted, despite his immense wealth. To do so he summoned a demon by the name of Terrormisu from another dimension, who agreed to grant his wish. However, she would do this only if he made his people starve. He agreed, intent on his wish coming to fruition, and his kingdom collapsed. He expected his wish to be granted, but instead she had tricked him, stolen his riches, and left his kingdom in ruin. But then, a powerful wizard by the name of Cannoli the First appeared and used his powers to seal Terrormisu within the Wishstone, scattering the stone's pieces far across the globe to make sure that Terrormisu would never be able to return.
And she will be voiced by Erica Lindbeck in the English dub and she will be voiced by Aoi Yuki in the Japanese dub.
Her sad mask voice will be voiced by Tara Jayne Sands in the English dub and she will be voiced by Maaya Sakamoto in the Japanese dub.
Her happy mask voice will be voiced by Erica Mendez in the English dub and she will be voiced by Rie Kugimiya in the Japanese dub.
And her rage mask voice will be voiced by Cristina Vee in the English dub and she will be voiced by Romi Park in the Japanese dub.