Fiddlesticks because he was on free week when I was level 1 and I love champs with lifesteal/spellvamp sustain. Then I fell in love with his ult.

I didn't play any other champ till around level 13. Orianna is my 2nd fave, so fluid.

Vlad. II love his attitude, love his story, so dark and graphic which leaves great imagery.
Also love how classy he dresses.
finally, I love how he plays. You can sit back and poke, or get right in there and even successfully initiate fights.
I started really playing him alot after his slew of initial nerfs.
I hated him at his release cause of how annoying and OP he was, but after his nerfs and he began to fall out of favour, for some reason i decided to pick him up and play him.
Even after further nerfs I still enjoy playing him and do very well.

Fizz
Because he's a fish that can troll and harass allll day long. Plus his e can be used as a flash
Urf with fisherman fizz =op

Lulu

I bought her from watching Gbob use her top lane, and I liked the on-hit playstyle, and her kit. Then I started playing her, and seriously fell in love with her kit.
She got shuffled fully into support, so I ended up learning how to support.

And now I'm a support main.

GG

Lux and Ahri.

Because they're cute, AP, and midders with skillshots.

Jayce, because tons of utility and hes fun

Miss Fortune, She has incredible early and mid game damage potential, so getting kills to snowball is easier than it is with other ADCs. I suck at CSing, so kill potential is very valuable to me.

Nami, used properly she is a good support and lots of fun to play

well my first champion and the one I main is miss fortune...I loved her desing and the fact she could wreck my face on that bottom lane on the ai-coop games sigh those times...so I farmed my ip a bought her she was the first champion I bought and if I want to win a game I usually pick her.

Though I don't like to say so, i guess Soraka counts as my main cuz I play her most often. I don't remember why I bought her I've been playing for too long, but I think it had something to do with the robot unicorn attack custom skin. I play her so often because nobody plays support.