Infinite the Jackal

A survivor in debris? What a fun find. I have just started thinking everyone are gone...

After casting his old self aside, Infinite picked up a persona that greatly amplified his dark traits, becoming a much darker and more lethal figure as a result. He also gained a far colder, subdued, menacing, and outwardly composed demeanor, with his speech being more eloquent, formal, and theatrical, although he still appears to show pleasure in causing others misery.
After obtaining unrivaled power in the form of the Phantom Ruby, Infinite believed himself to be unbeatable, causing his confidence and arrogance to grow to astronomical heights. Though his confidence was not without validity, his hubris proved to be so great that he would at times leave his enemies behind rather than kill them, believing fully that they were no threat to him. He would also often express a strong sense of superiority when speaking, all while showing no respect for others except himself, although people like Shadow would note that he had a "big mouth". Even in battle, Infinite would remain extremely collected, aloof, calm, stoic, and confident with a cynical, nonchalant, and sarcastic demeanor; when he faced Sonic the Hedgehog for the first time, he barely spared his enemy a thought even as they engaged in direct combat. Fittingly, Infinite would also mock those who found strength in others. He is, however, able to acknowledge attributes to his opponents he deemed commendable, as during his rematch with Sonic, he begrudgingly acknowledged that Sonic had improved since their last time.
Following his change of identity, Infinite became endlessly cruel, extremely sadistic, and horrifyingly ruthless. He took great pleasure in causing pain and torment for others. He also relished in how the world's population was afraid of him and had a twisted need to see others fear him, expressing that feelings like fear, anxiety, and doubt were "delicious" to him. He even willingly let the Avatar run unharmed from their battle, just so he could relish in their terrified screams. He also proved to have a dry, yet dark sense of humor.
Unlike Dr. Eggman, who would reveal his plans and motives, Infinite chose never to reveal anything vital about himself when confronting his enemies, making him mysterious and enigmatic; when Sonic tried getting information about his power from him, Infinite ignored all of Sonic's attempts to provoke a response from him and instead tried to eliminate him.
After gaining the power, Infinite grew very unconcerned with the opposition, seeing military organizations like the Resistance as little more than "rabble" or insects to be crushed by him. As such, he implies during his encounter with Silver that he was perfectly happy to allow rebellions against him solely for the sake of crushing them regardless of whether said rebellions initially served his immediate agenda.
After Infinite's fusion with the finalized Phantom Ruby copy, he acquired the ability to generate, destroy, and manipulate virtual realities, which he could turn into virtual reality projections to interact with reality. Said virtual realities are illusions, which Infinite creates by exercising control of one's visual and depth perception by feeding the brain false information infinite times.