Impersonating my channel

So I have a bit of an issue. I run a relatively successful gaming channel in a fairly niche community, and I recently came across another creator who has copied pretty much everything about my content. He's using the same thumbnail style, the same music, same editing style, even my in game crosshair and gamertag (literally my exact gamertag). At this point, it feels less like inspiration and more like he's trying to impersonate me.Whenever people call him out in the comments, he just brushes it off by saying he's a huge fan of mine. I'm not really sure how to handle it. Should I leave a comment on his next video asking him to tone it down? What annoys me the most isn't even the thumbnails or editing, it's the fact that he's using my exact gamertag and crosshair. I don't really talk in my videos, so those are some of the main things people associate with my content. By copying them exactly, it feels like he's trying to make viewers think they're watching me, or at the very least blur the line between his content and mine.