The object with the lowest terminal velocity that a person can make is typically one with a high drag coefficient and a low mass-to-surface area ratio. These characteristics would cause the object to experience a greater air resistance relative to its weight, resulting in a lower terminal velocity.
One example of such an object is a feather or a lightweight piece of paper. Due to their low mass and large surface area, feathers and lightweight papers encounter significant air resistance, which limits their speed and causes them to have a relatively low terminal velocity compared to denser and more streamlined objects.