When Henry Jekyll drinks his formula, the "HJ7," he turns into his evil alter-ego, Edward Hyde. Similarly, when Edward drinks the formula, he turns into Henry. Sometimes, under periods of great stress, Henry will turn into Edward without the forumla. When Henry's feeling particularly tempted, scared or mean, he can hear Edward's voice in his head. Edward can also sometimes hear Henry, though the conditions for that are more handwavey. The most important thing to remember about Edward is that he is Henry Jekyll, just witout any good at all. He is, technically pure evil. However, he's horribly selfish, so he doesn't always go out with intent to cause harm. He cares more about his own status and comfort. Edward has some modicum of super stregnth, but that will get bigger as he gets stronger. It's his cannon that he grows taller, bulkier, and horribly strong as the years pass.
Re: Mutations
When Henry's feeling particularly tempted, scared or mean, he can hear Edward's voice in his head. Edward can also sometimes hear Henry, though the conditions for that are more handwavey.
The most important thing to remember about Edward is that he is Henry Jekyll, just witout any good at all. He is, technically pure evil. However, he's horribly selfish, so he doesn't always go out with intent to cause harm. He cares more about his own status and comfort.
Edward has some modicum of super stregnth, but that will get bigger as he gets stronger. It's his cannon that he grows taller, bulkier, and horribly strong as the years pass.