First of all i would like to say. That this tier made from my side of watch what are the best choices you can pick for SoloQ as well and for a duoQ. The picks are working great for any of team comp.
tOP LANE tiER
Gnar is a perfect frontliner, cc also a playmaker for the team. Cho is nice tank that can also help to delete the carry's with flash combo R. Jarvan 4 is good for a team comp , also perfect dualist for top , same like jayce. You can play jax on your watch how you want. As it he can go AD and tank.
JUNGLE LANE TIER
Gragas , Jarvan , Sejuani. Team comp champs (Tanks , hard crowd control). Elise , kayn if you are looking for early gameplay to make the lead also perfect for soloQ carry.
MID LANE TIER
Talliyah , Twisted fate, roam champs. Corki if you need the ad mid if you have 2+ ap's in other lanes. Kassadin, malza makes the games on them own.
ADC LANE TIER
Tirstana , twitch , lucian. Are awesome in early game burst , try to pick them with aggresive early game support , like thresh , leona , alistar , rakan , morgana , bard. Xayah , kogmaw , vayne the adc's that's need very nice peel from support's that have ultility. Lulu , janna. Can be played with others sup's as well but smart.
SUPPORT LANE TIER
Thouse sups are just amaizing at any situation. Relays and the team comp what you need. All of them are hard to master , you can make alot of different plays with them. Thresh , rakan , alistar for massive engage. Lulu for peeling the carry, works good with duo partner.