Perseus is more commonly known as Percy Jackson. He acts as the narrator in the Percy Jackson and the Olympians series, or PjO. (I highly recommend those books btw) Percy, in the fandom, is also know as Persassy Jackson for his sass. He is a demigod, which is basically half-mortal (human), half-Greek/Roman god/godess. His father is Poseidon, the Greek deity of the sea. He also appears in the Heroes of Olympus series, Magnus Chase series and Trials of Apollo series as well.
"Poseidon," said Chiron. "Earthshaker, Stormbringer, Father of Horses. Hail , Perseus Jackson, Son of the Sea God."
—The Lightning Theif
A Misterious Soviet Person in Call Of Duty: Black Ops: Cold War; Targeted by the U.S Central Intelligence Agency (CIA), In the Campaign you have to Search for clues to find him, In A Scene, you can choose to Help Russell Adler (" (Truth) Solovetsky") to get a final attack on the Solovetsky Islands or To Betray Adler ( "(Lie) Duga" ) And detonate the Greenlight Nukes. On the Mission "Ashes to Ashes" after killing Adler, you met him in person for the first time, and for that, he gives you the Permission to Detonate the Nukes, Finishing the Campaign.
"If he's active, something big is gonna happen. Something that could shift the balance of the Cold War." Russell Adler talking about Perseus