Sigma Klim is the protagonist of Zero Escape: Virtue's Last Reward. In Virtue's Last Reward, he is a seemingly ordinary college student who has been abducted and forced to play the Nonary Game: Ambidex Edition. Sigma is generally a kind and honest young man, but his tendency to be easily swayed by his emotions makes him a poor choice for a game about trust and betrayal. Sigma is the only character in Virtue's Last Reward who is unvoiced; like the original 999 for DS, his dialogue results in voice beeps. In reality, this is done intentionally because the Sigma played as during Virtue's Last Reward is his 22-year old mind infused in his 67-year old body. In Zero Time Dilemma, Sigma reappears in the reverse scenario (67-year-old mind in 22-year-old body) as a member of Team D alongside Phi and Diana in the Decision Game to determine the ultimate fate of humanity.