An honest and intelligent man――the original personality.
His tendency to overthink things is both his greatest virtue and flaw.
Contrary to his peaceful appearance, he has a strong sense of justice. While alive, he was agonized by the "evil that lurks within humans".
A hedonist without morals――the "evil" personality.
A malicious anti-hero who instinctively injures all.
Being the evil that lurks in Jekyll's mind, it's unknown if he feels bad for the evil-loathing Jekyll.
While his mind and body are as Jekyll, his parameters decline and it becomes difficult to perceive him as a Servant.
Conversely, upon employing the Noble Phantasm to become Hyde, his parameters explosively skyrocket as if a recoil.