Terrormisu

Tiaramisu is a character who appears in Wario: Master of Disguise. She's a woman with blond hair who wears a mask over her eyes.

First Appearance
She first appears in episode 7, "Fouling Up the Works", warning Wario not to venture into the volcano. Later, in episode 8, "When Dolphins Ruled the Earth" she helps Wario advance through the boss fight. After this, she dissapears, stating that her powers will not allow her to go any farther.

Reappearance
'SPOILERS AHEAD - This section could potentially reveal important plot points of Wario: Master of Disguise''. Don't read this if you want the ending to be a surprise.'''

At the end of the final episode, Tiaramisu reveals herself to truly be a demon that was trapped within the Wishstone, and that her true name is Terrormisu. Now free, she plans to devour the souls of the world, but is defeated by Wario and Goodstyle. After the battle, Wario demands that she grant his wish, but she angrily flees back to her dimension, now no longer a threat to the world.

Reappearance Again
In Special Episode 5, Tiaramisu appears again, issuing a challenge for Wario and Count Cannoli to find her missing items, offering to give the one who does the most precious gem of her dimension.

Spoilers end here.