Possessed Howard The Tengu can infect a human body and eventually gain control of it. At first, when the Tengu possesses Howard in "Evil Spirit Week," Howard's eyes occasionally flash red, and feathers begin to grow out of his neck. Over time, he starts acting like a bird without control, like squawking and flapping his arms like wings. He gets exhausted until the Tengu takes complete control over him, which causes him to fully transform into a giant bird. When possessing another body, many of the person's physical features remain, like Howard's hairstyle and hair color.

The time it takes for the Tengu to possess someone varies, from a few seconds to a couple of hours. However, the Tengu seems to desire the control, and usually possesses the most available and closest victim.