[ -username- ] - possibly multiaccount, possibly cheating
account: https://osu.ppy.sh/u/8329828
started 7 days ago. Currently at 574 pp. Seems possible at first, but let look more closely.
His top 3 rank: http://i.imgur.com/Onjqsc0.png
His play history: http://i.imgur.com/odlDGtL.png
as you can see, his top 2 ranks are less than two plays. A little too good in my opinion.
his 3rd most ranked is 7 plays or less. Looking at how fast he is climbing, this is most likely legit.
However, it took him 7 plays to get his 3rd most ranked while it takes less than 2 plays to get his top two rank? (not to mention with mod) This is most likely done with cheats or multiaccount.
if he did multi-account, then the person that most likely help him was his girlfriend: https://osu.ppy.sh/forum/t/451052
another multiaccounting proof: https://osu.ppy.sh/forum/p/5101551
It's pretty rare to see a new player help out in mod section when they don't even have a map themselves.
Edit: please know that I'm not saying that this person is in any way a cheater or multiaccounter. I'm just putting this information up here because I feel like the person is and I'm also hoping that you pros can tell if he is or not.