Rein still has the most playtime for me, but I've been doing a lot of work with Junkrat and Zenyatta. Both are great for popping turrets and deployed bastions, which I hate with a passion.
I had an idea for a new character, too. I like the fusion classes they've got set up, but one I'd like to see is a healing tank. I was wondering what'd be a good fit and also add to the cast diversity, and thought what about, like, a Shaman (I know Pharah has Native American skins, but she isn't)? Make him big and burly, a la Vulcan Raven. I was also wondering what kind of healing effect would be unique to a new character, and I thought, "What about a targeted AOE?" You'd, say, hit shift like Zen, but instead of a HoT on one target, it's a burst heal effect in an area. The other ability I think might go well with it would be a very tight radius repelling shockwave. Minimal to no damage, and only in essentially melee range of the character. For his weapon I figured a hunting spear that could be used in melee or tossed with alt fire, but while another spear is pulled from the (is it still a) quiver (for spears?) the player would have no means of defense. As for an Ult, I thought maybe something along the lines of some sort of life-draining tar pit: while an enemy is in the area affected by the ult they move slower and take some damage over time.
Thinking up Overwatch characters is actually pretty fun.