The protagonist is the S in the middle of Greed Island: Sheena Moore. Sheena Moore's name originates from Ireland and means God's merciful gift.
Her ability is to sense the distribution of thoughts, which is considered as a trait + materialization system. After the ability is strengthened, she can manifest a thought distribution compass for others to use. If there is a thought input from the outside world, the compass can remain unchanged. This is why in G. I., Players can find other players they have passed by anytime and anywhere. The protagonist has other skills in extreme situations.
Other information:
Birthday: April 21 / Height: 159cm (when fourteen years old) / Weight: 45kg / Appearance: Black hair and eyes