DIRE LORE IMPORTANT QUESTION

Don't know. All skins are from alternate universes. We've never seen classic Yi take off his mask. So maybe, maybe not.

We don't know. We do know that Master Yi looks like a normal human though (unlike Jax) under the mask. Wukong even made fun of his helmet thingy in his short story.

It's been said above that we don't know but I believe a rioter said they envisioned a younger Master Yi when making the skin. A Yi before he became a master of Wuju.