There is a reason for Min and Max marked on the engine case/engine oil inspection window by the manufacturer. Not exceeding the recommended oil level is always sensible.
i'd request others also, to do some research/study the consequences of overfilling engine oil. Filling the correct level of oil is one of most ignored things.
If you still choose to overfill, it is totally up to him/her and I'd wish good luck.
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By level mark did you mean Low mark? if yes, then it is absolutely safe, just ensure the oil level does not fall below Low/Min mark and additionally you would need to top it up as early as possible to the Max mark on the engine oil inspection window. Please follow the instructions specified in the manual for the correct way of checking the oil level.
Semi Synthetic oil best suits to bikes like Gixxer, if you wish, you could switch to SS oil on the next oil change. one of the many SS oil you could try is Shell AX7 10w40.
Cheers



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