Infinite is an enigmatic and mysterious, yet lethal and dark figure. He is cold and stern, though deeply sadistic and cruel. Prior to becoming Infinite, however, he had at least some degree of care for his men in Jackal Squad, as he angrily confronted Shadow over the destruction of the Jackal Squad before fighting him. He is also extremely sadistic, taking great pleasure in the pain and torment of others. He even willingly lets the Avatar run unharmed, just so he could relish in their terrified screams. His violent disposition was present even before his transformation into Infinite, as evidenced by his striking the Phantom Ruby with his sword, causing it to reveal a desolate, war-torn world. It also seems that he greatly dislikes stagnation, admitting as he joined Eggman that he had grown tired and bored of the world, and desired to change it, evidently for the worst, just to provide some amusement.

Extremely collected and confident with a cynical, nonchalant demeanor, Infinite presents himself as perceptive and aloof, toying with and barely sparing his enemies a thought even in direct combat. He also appears rather arrogant and sure about his strength, as he often exhibits a sense of superiority when talking to others and shows little respect for figures like Sonic. His arrogance was evident even before becoming Infinite, as he constantly referred to himself as the "Ultimate Mercenary". Fittingly, he also mocks those who find strength in others, believing that one can only rely on themselves, and that friends and allies are nothing more than a "fleeting illusion". He is, however, able to acknowledge attributes to his opponents he deemed commendable, as he acknowledged before attacking Omega that the latter was "spirited" and during his rematch with Sonic, he begrudgingly acknowledges that Sonic had improved since their last time.

His most notable character trait, however, was his inferiority complex, especially regarding any perceived weakness he might have. This was most especially apparent when he fought Shadow and was easily beaten by him. After Shadow bluntly told him he was worthless and told him to not show his "pathetic face" to him ever again, Infinite proceeded to rage about how he was not weak before ultimately subjecting himself to being fused with the Phantom Ruby prototype, and completely discarding any trace of his old identity, to the point where he refused to show his own face. Other indications of this trait were shown where he expressed disgust at Eggman calling a retreat, viewing it as a tacit admission to weakness. Even after his defeat, Infinite tries to insist that he can fight on, even as he is pulled from the battlefield. This inferiority complex is implied to have developed into a mad obsession with strength. When Shadow runs through a Phantom Ruby-made Green Hill, Infinite's thoughts are echoed through a false Omega, constantly repeating that he was not weak, almost like a paranoid reassurance, showing Infinite as a truly insecure individual.

Owing to his obsession with strength, Infinite also demonstrates a Darwinian view of life, which is especially evident with his fight against the Avatar at Metropolis, where he declares that the weak ultimately exist solely to be vanquished by the strong, and later his admission that he underestimated how desperately the feeble will cling to life when the Avatar managed to hold their own against him. Strangely enough, as well as ironically, he gets along very well with Nazo, despite them refusing to work with each other.

He is voiced by Liam'O Brian, here is an example of his voice acting: https://www.youtube.com/watch?v=aI6ZPEjJ6rg