Ultraseven
This is the person who plays the human body, but in OVA, it is Kazamori Masaki, played by Katsuyuki Yamazaki. Others may be Sai Wen 21 (there is no fixed human body), Sai Wen X (Jin) … different from Sai Wen. This man in the picture is a cluster of stars, played by Kohji Moritsugu. He is the original, and he also appears in Dream Bius and some theatrical editions.