To be fair, the job description is support. I know, I know, but zen carry whatever but real talk: you pick support, you pick a side kick. Of all of them, Mercy is the most “side kick”
That being said: you pick a support, you’re my hero. Whenever I get rezed I’m tripping like, “AN ANGEL HAS CHOSEN ME, BEGONE ASSORTED THOTS, MY TALE IS NOT YET OVER! MIRACULOUS DAY! BY THE POWER OF LORD KAPLAN, I SHALL SLAY ALL THOSE WHOM’ST APPROACH MINE SUPPORTS!”
You could have a carry support or 2 to swap to when mercy isn’t cutting it.