Rinnee said
I can definitely see them having some sort of relationship! If you're open to it, I wouldn't mind them being close friends? They could have known each other through Mercedes grandmother, and after she grew ill maybe Vanessa started to go to Mercedes to heal her injuries? This could be a good excuse for anyone to have relations with Mercy though, but it's just an idea. Up to you!
That could definitely work. I can see Vanessa being a bodyguard-type for Mercy.
And power replication is one of my favorite powers (I have a bunch of characters that are an entire family of them), but I think he shouldn't know how to use any powers right off the bat.