Human No. 2 (ヒューマン2号?), real name Junjiro Iwaki Hyūman 2-gō (淳二郎岩城?) is a Junjirō Iwakikaijin created by Toho that first appeared in episode 9 of the 1972 tokusatsu kaiju show, Assault! Human titled Last Moment of King Flasher.
When in his Human No. 2 form, he has an Ultraman-like head which is covered by a large spiked helmet. Almost all of his body is red besides small blue and white stripes on his legs. Junjiro also wears silver gloves on both his hands, armor on his chest, a belt and silver anklets.
Unaware of his brother's Human No. 1 form, Junjiro set out to follow his brother. This leads to Junjiro finding out about his brothers alter ego, and decides to assist him in combat with a monster. But, Junichiro was killed and the children transformed Junjiro into Human No. 2 using a second type of Human-Sign called the Human-Sign Red. Junichiro was then later resurrected, and Junjiro often assists him.
- Due to Toru Narita designing the Humans and Ultraman, the two bear slight resemblances to each other.