Choi Seung-hyun as Thanos in season two of "Squid Game."No Ju-han/NetflixFans and critics are raving about a new player in "Squid Game" season two, Thanos.Thanos is a rapper who seems to delight in the death games.Choi Seung-hyun, who plays Thanos, was already a popular K-pop star before landing the role.Warning: spoilers ahead for "Squid Game" season two."Squid Game" season two introduces a new cast of eccentric players, but the character fans and critics are talking about most is Thanos.Thanos (Player 230), named after the alien the Avengers fight in the Marvel movies, is a purple-haired, self-absorbed, and callous internet rapper and one of the main antagonists of season two.He takes over from season one's Jang Deok-su (Player 101) as the main bully within the deadly children's games.