Let's just say your team doesn't need any hero in particular. They have a good five-man setup already. What hero would you hop on immediately?
Mine is Reinhardt. It's just so fun to beat people with hammers, and that feeling when you finally pin that elusive Tracer is amazing.
Also, my hammer is much bigger than yours.
[spoiler]The luckiest seven you will ever meet[/spoiler]
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Genji but if he is picked then zarya or zenyatta. If 3 tanks then reaper