I know it's all a matter of opinion, but I have not found a steady main in this game. No matter how hard I try I always get bored of who I play after binge sessions as them. I also tend to drop mains after a bad loss (another bad habit).
It really sucks for me, because I feel like I'll never find the one champ that I enjoy playing over and over again :/
Never played to win. Winning was a nice perk to getting good, at both the game and the champion, but when you care more about the gameplay than the end screen, is when you will find your main.
Mine was malzahar, but then riot removed him from the game and replaced him with a doppelganger. I found him by just playing and looking for interesting ideas and ways to make the game interesting. AD malzahar was what i found, basically a marksmen who uses voidlings to do his damage, doesn't crit (because fuck that stat), yet still deals respectable DPS.
Obviously there are some weaknesses, but for every extra weakness malzahar has as a marksmen/adc, he brings other strengths. CC for mobility, total DPS for crit, mixed damage for aoe.
I found Mordekaiser by pure chance. I reached level 3 and was give 400 RP. He had happened to be on sale for 395 RP at the time, so I said what the hell and bought him. The next 2 and a half seasons were spent blissfully destroying people with Mordekaiser. Then CertainlyT fucked him up and I stopped enjoying him as a champion.
Then I discovered Sion, and fell in love with his design, character, and strengths. The last season and a half with have been wonderful
I tend to switch between a couple of mains, sometimes i play 
mid all the time, then i go back to 
top, then i play 
top for a while.
Bottom line being i really love auto attack based champions that have a very basic kit, but require a lot of game knowledge and strategic thinking to execute, While also being able to carry the game when ahead and take down towers in no time.
So basically, find a playstyle that suits you, and play the champions that fit the playstyle. Just my opinion here.
one of my first ever champions
I sometimes enjoy watching the world burn.
Fell in love with this guy after getting 1k AP as a support.
Maybe they'll rage quit if I Q more...
How to be the most hated champion to the enemy team without doing any damage at all.
I found my main after falling in love with a particular thematic and a satisfactory playstyle that answered a problem I had.
Sion's thematics are awesome and he keeps people in place. So I find him fun to play.
Course I play other champions as well so I can feel more than a one trick pony, but Sion is who I look forward to playing most of the time.
Find a champion that provides an answer to a gameplay problem you have a lot, or find one with a thematic you enjoy.
Most importantly, find someone that you enjoy playing. Whether it be their playstyle or personality. Don't be a FOTM main.
it would be cassio for me im interested in snakes got 2 by myselfe i also love medusa and im interested in different kinds of poison. i startet shortly after cassios release around pre season 2 and it didnt took long for me to get to her and the love for her stayed shes that champ that i will always getting back too even if i played something else for a period of time . gameplay wise i loved the poke queen and the ability to turn the tides of every fight even when behind .
I tried everything that was on free week, literally everything. Then bought and played the ones I really enjoyed.
I personally don't have one champ that I enjoy playing constantly. The closest would be Lux. But I have high mastery for many champions because I get bored easily and need to switch. Even in ranked, I tend to play something different every game, though they tend to be similar style. Ranged, poke, utility.
Maybe you aren't the type to main just one champion.
I have run into similar issues myself. My solution was to build up a champion pool rather than select a specific main champion.
I'll try to get at least four champions (though generally closer to 8) who I enjoy playing and am good with in a role and pick among them.
Between the added versatility and the flexibility, I much prefer my approach.
LoLKing said I was 7/1 wins with Cait Season 3, so I thought I must be better with her. Been playin her for years now. Plus I love range. I play Hammer in HotS.
Riven was the very first champ I've played when it was free. When they rotated the free champs, I really missed playing "that champ without mana" so I bought it as fast as I could and have been playing her ever since :)
For the longest time, I used to just play a lot of Lux and Ashe since I liked the particles and the small plays I could do back when i started in 2014. Early in 2015, I came across a League of Legends streamer who played Ahri one day. I had played her once before, but I was a nub and didn't really know what I was doing. After a while, I began to enjoy her more and more, considering her as a very high skill-based champ. For a while, I had been wanting to find some champ to play that had a lot of flair with a chance to offer a lot of mechanical prowess.
Later that year, I found a video here on the boards the pushed me to try harder which I eventually did
https://www.youtube.com/watch?v=RqXWjBCmNqM
She offers a lot of plays, can duel and teamfight and every time I pull off some trick like running in, bursting the carry, then zoom out make me giggle. The outplays I can do, the weaving of my charm, orb, and spirit rush. Even on my bad days, I can't help but smile for that one skirmish that tests my limits of playing her.
After seeing Drift King Azir montages, I knew Azir was the champ for me. Sadly though I haven't played him in a while due to repeated nerfs. He just feels too weak now. I mean he can still carry like hell, but other champs do it so much easier in comparison now. I will revisit him one day though. He will always be my favorite champion.
I found my main kha'zix when i first started playing the game back in season 3. I saw a guy playing kha'zix jungle and seeing this bug type champ hide in the bush just made it look really cool to me. Ever since hes been my main
When I started, I picked champs mostly on thematics (badass ladies), flashy fx, and costumes or models I liked. Ended up with Syndra and Cassio while leveling.
Once I joined ranked queue, I realized I had to find a champ I could actually play reliably since there was no chance of getting mid every game. At that point, I went with Zyra for sup/mid and Teemo for top. In the ultra-rare case I couldn't get one of those three, I could take either in jungle or get by as adc Teemo. Usually that ended up in a swap...lol.
I stuck with 
and for around 350 games last season. Once I got to gold (mission accomplished!) I decided to learn 
because I always thought she was so cool, but I was garbo with her every time I tried her. Basically spammed Kat mid/top for the next 100-ish games and topped out around gold 3.
Preseason hit and my Kat win rate went from around 60% to around 15% because balance. Went back to so I could have the dps to handle tank assassins and assassin tanks. 200-ish games on her this season. Then her mid lane was gutted in the rework and nerfed again and I haven't played her since.
So now I'm back to with mixed results. The thing I love most about her is that her success rate is really tied to your game and matchup knowledge. Even when I lose with her or feed my ass off, I end up learning something about the game that makes me better at every champ I play.
For example, Kat's close range diving playstyle made me so much better at Lissandra than I was before I picked up Kat. And there are other general things, like counting ccs and looking for engage windows (eg jumping on Lux when she misses Q or Ahri when she misses E). When to roam, how to gank, and sizing up a winning/losing roam. How to farm in bad lane matchup. Stuff like that.
It is mostly just find the style of play that you like and learn the champions that fit that style and then pick the one you do the best on most consistently. For me, I can't stand ranged gameplay so that narrows down the selection a lot. I also can't stand squisies so that narrows it down further. I'm a team player and like being able to save my team mates from near certain death. With those categories I narrowed down to 
and 
. It then just depends on which lane I get as to who I pick. If you look at my smurf name above I think you can figure out who I picked as my main.
first time I played this game, I looked at all the champs. found the champ that I thought was the best at the time. based on looks and reading the skill sets. saved until I could buy him
"wukong" back in S2 I think
Since S2 I've thought 
was really cool but I never got around to really playing him. This season I just did it. Now if I don't play I get bored by 5 minutes.
I started maining 
in season 6 after maining 
during the preseason and getting bored of her. I picked nidalee because i had always thought she was a cool champion and knew she had a high skillcap which drew me to her. Now I have over 300k mastery points across 2 accounts with her because of how much fun I've found in her. Just play who you like.
Trial and error.
Turns out I love annoying people and I can actually get good at it.
Lulu support fits into that playstyle real well.
I was really new to the game (around level 5, maybe?), and I saw that there was a champion with infinite scaling AP. I bought him immediately, and played him exclusively up until around level 20-25.
My love for this game was founded in playing Veigar. I will never have another main.
Basically you just pick a champion based on what you enjoy doing rather than what you're strong with or what's 'OP' at the moment. Play what you think is fun, even if that means you're jungling yorick or playing support trundle.
I ended up playing 
; I came across him by accident on free week when someone banned what I originally was going to pick/I panicked. Turns out he was the most fun champ I ever played.
