Sparkle

Sparkle is one of three supporting characters (along with Cheeseborger and Slushie) in the animated series Chicken Nugget.
This is a demonic and mysterious, but at the same time truly friendly "rabbit".
Normal form
Iskrim is an anthropomorphic white rabbit with red fur on the insides of his ears, as well as eyes with black sclera and tiny, split red pupils.

They are capable of a variety of terrifying facial expressions. According to Fwench Fwy, this is not their "true form," which is later revealed.

True form
In episode 278, their true form was revealed: a dark spot covered by black eyes with red pupils. According to the description, Iskrim can also change shape.

Horrible form
This form mostly retains the rabbit-like appearance of the normal form. However, it is slightly more terrifying. In this form, Iskrim's eyes become swirled or tunnel-like, Iskrim's fingers become sharp, and their skin becomes wrinkled. It is also shown that with this form, they can significantly increase their size at will.
Iskrim may appear sweet and friendly on the outside, but he's actually a force to be reckoned with. Iskrim is interested in the dark arts, performs bloody rituals, tries to get kidnapped by Krampus, flirts with monsters under the bed, and even tries to summon Satan (but accidentally summons Santa instead). Because of this, most people around him are afraid of him. Iskrim also has a knack for irritating people, which he most often does with Fwench Fwy. However, Iskrim is afraid of cute creatures or glowing beings.

Despite this, nothing about him seems truly malicious, and he seems more like a friendly troll, as he's shown to befriend the other main characters and even date Fwench Fwy. Over the course of the series, Sparkym gradually became less and less scary, to the point that in most episodes, he's the butt of jokes and constant ridicule, bullying, and annoyance from the other characters.