What's Your Job
So these comps are a little weird, like Flats said, it's not worth worrying too much about your comp making sense, but it can be good to think about what your comp needs to be successful and what the enemy comp needs.
Here I would say that the enemy monkey wants to split your team core so that the backline can close in on queen or he can take out ana, and the enemy hanzo wants to look for picks, which will mean dealing with your hanzo.
Conversely, your queen wants to survive monkeys engage (doable - she has wild sustain lmao), and then she wants to abuse his position using her shotgun and knife and axe etc.
Given all that, I'd say you have 2 main jobs:
- Enable your hanzo, since the enemy hanzo has a mercy pocket, if yours doesn't, it's going to make it much harder for him to take angles competing with their hanzo
- Don't die, this is kind of always a big deal for mercy, since she doesn't tend to do damage, it's very rare that she ever makes a play worth dying for
Then secondarily you want to try and help the ana if she does get targeted by the monkey.
That's just my thought process though, which is by no means perfect, so if you have any ideas for other things that would be happening there or that you'd be responsible for, let me know because it's good practice for both of us to think about.