In my opinion if you're not giving a very unique traits to the character, readers whose love and capable to visualize what they're reading, they'll continuously imagine the MC as a green orc or as a negative character. You must write a very unique character trait right from the beginning or something which is going to make a real difference between your character and the well known orcs... or the readers, especially fantasy readers will refer automatically for these creatures as they read, regardless your intention is different.
Reading your background reference this approach may work out well if you can find an appropriate balance in the traits of your character and the descriptions.