Five, as their name suggests, is a poorly-drawn Arabic numeral five. They have a purple body and lighter purple limbs. They are very irritable and sarcastic, where they complain about Nine being so annoying. However, they are shown to be knowledgeable and is very law-abiding. After Seven is about to explain the "7-Ate(8)-9" joke, Five explains that cannibalism is not allowed in the Equation Playground. However, even with how grumpy they usually are, They have their own cheerful moments.