Bella Noche is a being of pure anti-magic and the main antagonist of the episode "Betty." It exists in another dimension and has the power to remove other people's magic. Bella Noche can escape its dimension by using a unique staff (in this case the staff of Stranson Doughblow), a sword, an orb, and a goblet arranged inside of a circle drawn on the ground.
In its "weak form," Bella Noche is nothing more than a large head made out of a green, slimy substance inside of a grey box. In its "powerful form," Bella Noche creates a black anti-magic box around itself, which absorbs the magic from other wizards. Inside of the box, Bella appears to be a slim, blue-skinned humanoid with long white hair. Bella also wears a long blue robe. However, it seems that anything inside Bella Noche's black box has a blue tint to it, making it possible for the being to have a slightly different color scheme than what is shown. In both weak and powerful forms, Bella Noche speaks in a deep and raspy voice.
- In Spanish, bella noche means "beautiful night," though it's mispronounced (The "ll" should sound like a "y" or a "j."). Translated into Italian, "Bella Notte" is the name of a song from Disney's Lady and the Tramp.
- According to Jesse Moynihan, "The name 'Bella Noche' comes from a girl that used to work at a coffee shop I would frequent. Her name was Bella and my brother would call her 'Bella Noche,' because she was like a starry night sky or something."
- Bella Noche's "powerful" form somewhat resembles the Ice King/Queen through his white hair, blue robe, and bluish skin.
- The items (a unique staff, a sword, an orb, and a goblet) that are needed in order for Bella Noche to escape are loosely based on the four suits of tarot, namely wands (also known as batons), swords, pentacles (also known as coin), and cups.