I've made a lot of TF2 vs Overwatch posters, but I feel like Medic and Mercy would get along. I'll also be uploading the TF2 vs OW ones. Their currently on my DeviantArt (enderandy05)

Honestly, I'm not happy about the Medic's smile at all. I tried so hard to get it to look right, but this is as close as I can get to it.