Mayoi

The Mayoi is an artificially created plant-fungi animal hybrid created by Sycorax in Big Hero 6: The Series. Though small and adorable, they can grow to become vicious monsters that Mr. Sparkles can control.

Background
After being accused by Hiro of supplying San Fransokyo with genetically-engineered monsters, Liv Amara used her recent alliance with Mr. Sparkles to improve her public image. She create the Mayoi using plant DNA to give them the ability to grow. Once they were unleashed into the city, the citizens were captivated by their adorable appearance. All except Hiro, who was suspicious from the start that these creatures were bad news. Liv Amara also altered Mr. Sparkles using the Mayo's plant genes, giving him control of the Mayoi population. By doing this, Mr. Sparkles could take the fall for Liv's schemes. Liv would appear as a hero in the public's eye in stopping him and the Mayoi.

Physical appearance
At a infancy stage, the Mayoi resemble green fluffy axolotls with stripes and fluffy tails. Their fur is, in actuality, however, algae growth. Their ears resemble leaves, resembling more like plants than animals. In further stages of development, they keep mainly the same design until they are fully matured under the control of Mr. Sparkles in which their algae become sharper and its color darkens, and their eyes glow green.

Trivia

 * Mayoi is the Japanese word for "doubt", "hesitation", and"bewilderment". When written in kanji, Mayoi contains 迷い, while "迷" refers to "lost". This could be in reference to their role in presenting Sycorax as an ally to San Fransokyo.