I don’t think you need to change anything, after all, it was purely a coincidence. 
And there are quite a lot of characters that look the same or similar between different stories by different authors, we have limited features available to us, so it’s understandable that there’ll be characters that look alike sometimes, but when there are too many similarities between things as a whole, like plots, names and appearances, then that’s a cause for concern but I don’t think you should worry about your character looking a lot like someone else’s.
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