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It's all bout the element of hiding important facts and creating smoke and mirrors. Not sure what your story is about, but you can have it so this character suddenly walks off when no one was look...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27108 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It's all bout the element of hiding important facts and creating smoke and mirrors. Not sure what your story is about, but you can have it so this character suddenly walks off when no one was looking and doesn't return. Gives them the element of being shady when really they went off for good reasons. The other key is to not give away the real information. Give enough to build the character, but mask some of the details. I think from HP Severus Snape would also be a good character that follows what you are looking for. They did a really great job of hiding his true self until the very end. All along we thought he was bad but ends up being a key hero. It's all about perception and creating event points that, when only half of the information is present and the dots are not connected, make them appear to be one way, but then at the end, when they back track all the events and fill in the gaps, you are aware that your perception was wrong all this time.