[Sunred]

Prof. Hazuki was portrayed by the late great Ichiro Mizuki, the GOAT of anime theme songs, founding member of anime theme song super group JAM Project, and the voice for the Powered Custom stuff in this show as well as Tategami Lioh stuff. Before he passed away in 2022, he sang anime and tokusatsu songs since the 70s, even earning the nickname "Aniki" or big brother in mainstream Japanese media.
He's no stranger to tokusatsu as well, having sang many themes and insert songs and even acted in some, his most notable appearances other than this show being the Metal Hero show known as Jikuu Senshi Spielban (which he sang the theme song for) as the titular hero's father, Ben, and Voicelugger Gold in the voice actor-centric tokusatsu show Voicelugger from the 90s.

Jikuu Senshi Spielban

Voicelugger