In the past timeline, there were a lot of players who dominated the game's spotlight and a spot that has been claimed by an influencer gained the attention of the masses due to her weird but unique way of using her own mental disorder which is the multiple personality disorder. I am not really an expert on it but according to some of the players who have teamed up or have personally interacted with her, she indeed has multiple personality disorder as they tend to change a lot in terms of their personality. They can't even say it is the same as bipolar as some who have interacted with a bipolar is not this bad in terms of changing personality.
She was Phantomia, also known by players as the Gemini Player. The reason they call her a Gemini player instead of "Jekyll and Hyde" is because the dual personality of the person is similar to twins. Although they share the same body, both personalities seem aware of each other and it seems they are in sync a lot.
