(Problem) What piece?

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In the following diagram, there is an unknown piece/color on h2 (here labelled as a Black knight just because Chess.com doesn't support other markers). What is that piece so that the position is legal?

The original post is here, post #418. Since I believe this is a good problem that I created, I also cross-post it here, so I can keep track of my good problems. :P

Hi, I'm chaotic_iak!

I will mostly post chess problems here! Note that I'm doing problems and not tactics puzzles.

Problems that I post and have no acknowledgement are created by me. You can comment on any problem to ask for a solution, and I will get to it as fast as possible.