SCP-999, also known as "The Tickle Monster," is a gelatinous, amorphous entity with a consistency similar to peanut butter. It has an orange hue and is often described as being very playful and friendly. In terms of height, SCP-999 is about 2 meters (approximately 6.5 feet) wide and 1 meter (around 3.3 feet) tall when resting on a flat surface. However, its form is highly malleable, allowing it to change shape and size to some extent. He also smells like vanilla ice cream scent.