Well, My previous main was Irelia. I found her because one game, an enemy top laner picked her. This was at the start of my top lane career, and that Irelia was awesome. So I looked at her kit and said "Why not? Might be fun." Now I have over 70,000 mastery points with Irelia, and even though she's a former main (I never could really get the rework on her passive, it may seem like a small thing but it's a big difference), she has the most mastery points of every camp I own to date by about 30,000 to 25,000 points. This includes my Mastery 6 Trundle and Yorick. Right now, I'm still looking for someone to hardcore main. I started playing Jayce, but he's actually pretty situational as a pick, and really easy to counterpick since Kayle, a huge counter, is only 450 IP (I think). I've tried Trundle, who I mained for a good long while) and Yorick (who I had gotten to mastery 4 after the full VGU rework was announced and before it was implemented) and old Yorick was fun, but new Yorick is still fun and is also much more relevant and easier to use (though RIP yorick's old ult - I loved that thing). I've also mained Poppy, Draven, Kindred, Nautilus (mainly sup), Aatrox, and I'm currently looking into maining Camille or Kled. But really, finding a main is about finding the playstyle you enjoy most. For me, that was old Irelia, back when she was a very rare pick and could actually go AS builds and not AD Burst. And, then, looking at champ impact is good if you want a main you can take to ranked (like most people), so certain champs that might be irrelevant you might want to pass up on. That being said, some of those champs aren't actually irrelevant, and discovering a rare, unused, strong champ has always been one of my favorite things to do.