Here is the question. What would happen if the Hero Factory heroes somehow ended up in the matoran universe, or spherus magna? After that, what would happen if they fell into a vat of energized protodermis? Assuming that they aren't somehow immune, and aren't destroyed, that only leaves that they are transformed. These M.O.C.s are an answer to these questions.
Before getting into the two M.O.C.s that i will put in this post, I should mention that the energized protodermis changed the Hero cores into Nuva cores. This doesn't change their personality, but it does give them a core power, which is basicly a mask power that is part of the core, and can be copied by the mask of Emulation.
First up is Roka. The transformation dropped his speed a bit, but in exchange for incredible strength, not to mention the element of light. His core power is strength. this gives him a strength upgrade equal to that of a Pikari. This with his strength of a Onu- anything gives him strength equal to Onua.
The second one is Surge. He was given the element of water, along with the core power of stasis fields. His build was made more agile. He also got new weapons, a pincer-spear, and a new model of lightning gun.