Hello all, first time poster, yadda, yadda, yadda.
Came across this fic by Flame011011 in Fanfiction.net earlier, thought it looked (very) familiar:
The fifth element, by Flame011011.
Without too much digging, this other fic showed up
Harry Potter & The Fifth Element, by Bexis1.
There's only one chapter posted on Flame011011's account, but it's clearly a word-for-word copy of Bexis1's first chapter, with the author's notes stripped. It's been reported to FFN, and clearly I'm not the only one who noticed the plagiarism, since the reviews he's gotten call him on it, too. I got a couple screencaps from both fics, just in case, I'm just not sure where to post them so members of this comm can access them.
I did a cursory checking of the other fics he's posted on the Percy Jackson and the Olympians fandom, but those appear to be original.