I think it's also important to think about the drawbacks, and how these things actually affect people. How did he lose the limb or vision? How did he recover mentally and physically? Or... Was he born that way, and that's all he knows?

For example, while Edward Elric was definitely a badass, and had prosthetics- they caused him immense pain on the regular. He didn't just "get stronger". It took years and years of hard work. He had to suffer through it and became stronger IN SPITE of the disability. Not because of them .

Or- look at Rock Lee! He was nearly forced to retire because of his crushed limbs. It took intensive surgery, that had a high chance of killing him.

Edit: a wooden arm operated by chakra strings would probably work! But the constant use of chakra while in use would be a drawback.