Do you have a go-to champion when you really want a win?
Do you have a champion that rarely fails you?
Mine is
. Whenever I'm feeling unconfident I just go Malz. Farm from a safe distance, push forever and Ult whoever walks too close.
Do you have a champion that rarely fails you?
Mine is
. Whenever I'm feeling unconfident I just go Malz. Farm from a safe distance, push forever and Ult whoever walks too close.

If i need a win that's who i pick.
he can snowball the game hard and in my elo he will never fall off, because nobody will have the items at the right times.
.
I am NOT a support only player mind you. But...... if I'm duoing someone and want god-like control over the game, these two. I play about 50 champions, but these two are like the Sun when looking for warmth, because I actually can almost maximize their potential at most elos, including high Diamond.
I fell in love and just kept on trucking with him. Even when behind I feel like I’m strong enough to carry just about anything.
but mostly 
If I was playing in clash or something with reliable teammates and really wanted to win I would play
jungle. Easily my best position and champion, but in soloque I cant carry late game on him so I don't pick him.
Jungle
Top
Support
Easy to play strong champions.
AP Nasus. Or Ornn. Or LeBlanc.
Top lane, Trundle, Gnar, Darius, Tahm kench, nasus if we need it
Mid lane, Ekko, teemo, Veigar
Jungle, Udyr, Vi, Yi
Support, Udyr (Don't question it), Braum
ADC, Lucian (Best adc), Jinx (second best adc)
I am a top main, but i have played several champions to learn what champs fit me best in each lane