As a hatchling, Junior resembles a small version of Godzilla with blue skin, a gray underbelly, small dorsal plates, and large eyes. As a toddler, Junior looks like Minilla, with a chubby build, green skin, a yellow underbelly, and large eyes. As a sub-adult, Junior closely resembles Godzilla, only shorter, hunched over, and with green skin, a yellow underbelly, and smaller dorsal plates. As an adult, Junior looks identical to Godzilla.