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When you change your character selection, you can go back and use whatever skill points you’ve earned to upgrade that character before taking them on a mission. This is a great way to ensure that you’re not under-leveled whenever you want to change heroes.
You certainly can complete the entire game without ever-changing characters — though given that the game has four different heroes to choose from, all with different skills, you’ll want to test them all out.
Source: https://www.distractify.com/p/how-to-switch-characters-gotham-knights
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