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"One day, nothing significant happened. Everyone got on as normal". What does your character do on that day? If they cannot get through a normal day, doing normal things - which may vary depending ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/5802 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
"One day, nothing significant happened. Everyone got on as normal". What does your character do on that day? If they cannot get through a normal day, doing normal things - which may vary depending on the setting - then they may be a Mary Sue (a term I had never heard before, but I recognise the trope). If you are worried that you are creating a Mary Sue, try writing a normal day for them, and see if it works. You will probably not have to go far into the day to know. @StevenDrennons answer and @Standbacks comment are an excellent checklist, but for a quick way to know, this might work. In fact, just trying to start grasping what a normal day would be might work.