Do I have to make any changes to my character, or is he fine? 

I thought I'd try something new since this is sort of like an alternate universe/timeline to the canon one, but if there is anything wrong, I am always happy to discuss changes. 

As you stated with the previous post, if you were to restrain where their powers are capable of being directed, it would stop their ability to manipulate. 

Can I request a special case for mine? 

I had anticipated this, since I remember the scene from the game where Delsin was restrained by Augustine in their battle, and had already thought of an alternative. For my character, can it instead of being his hands that must be restrain, merely his eyesight? Since he already has major issues with sound and spacial awareness due to the overloading from his powers absorbing everything around him anyway. Without his eyes to distract, he would be put in a state of extreme mental pain and shock. This would make it so Marx still has a way of being restrained, but also have the uniqueness I tried to build him around, being that his powers are not tied to any part of his body specifically, but rather conducted through his state of mind. I had made him purposefully mentally unstable so that his powers are nearly impossible to control without him able to distract them.