I'm glad to see that the latest version finally helped us clarify what type of shapeshifter Ella is.
We've been debating for years how exactly her powers work when compared to MC.
So it looks like (according to the doll) Ella can gather information just by looking, just like MC can gather information by touch.
I think the implication is that at least in the beginning she was a much stronger shapeshifter than the MC, because her only limit was her imagination. At least when it comes to combat. But she doesn't have mind reading or knowledge copying powers.
I also think that she probably doesn't have the same weakness to electricity as MC, because unlike MC, she shouldn't have a problem visualizing completely inorganic substances that will be completely non-conductive.
But whose power are better?
MC definitely has abilities that have more uses overall, but in terms of combat, Ella should probably be stronger, especially if her visualization limits are very high. I'm just guessing in this case, but I think Ella should be able to a certain level mimic some monster abilities as well. For example, MC can create blade made of ultra-strong monster metal, but he cannot imitate the power that originaly flowed in the blade and made it even stronger. Ella's visualization could probably read the energy of that blade and mimic it at practically full power. She must also be extremely dangerous in long fights, because the more she sees your abilities in action, the better she will understand how they work on a fundamental level and will be able to visualize more effective defenses.