Are there missions where you have to play certain champions?

I haven't started the Cats vs Dogs missions yet, and I'd like to know if there are missions where you need to play specific champions and there's no way around it? I'm waiting for Your Shop, so I only allow myself to play 4 champions now, which makes it annoying if there are missions where you NEED to play certain champions and there are no alternatives.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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