As characters can't change their appearance without being recreated it means one of two things occurred: either you remade your warlock and don't recall having done so or someone else accessed your account and did so.
You do have quite a few deleted characters with only a few minutes of gameplay on them: https://wastedondestiny.com/1_4611686018453394136. Do you recall this occurring?
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neither of the two things occurred at any point. I would NEVER have deleted my Warlock and nobody has EVER had access to my Destiny/Xbox/Steam accounts. AS for the deleted characeters thing. None of them have been over a day of play time. Most of them were for the medal farm back in Guardian Games which were like 7 minutes. Highest is 20 hours on my hunter because I needed a character to delete, my warlock has about 3K hours played in D2 alone so no, it was never deleted.