so your a support main
and you happen you run into another support main thats a higher pick than you and locks in a support. lets say you're not as confident in your other roles as you are in a support role. lets say you're not sure what to pick in other roles.
so heres some champs to pick when your force to fill as a support main
top
the late game hyper tank with a potentaly fullteam taunt and a global shield able to not only save your adc but get them kills too.
also a massive tank with a ton of cc.
also a tank with cc and a damage denying ult, can easly turn loseing games in a single well played teamfight.
although he lacks cc susan will always become a threat late game and the longer the game goes on the better.
with his aoe knockup and aoe silence and high base damage he will always fit into any comp.
mid
damage, cc, and utlity a supports wetdream, although she requires a level of skill to use correctly a good ori carrys games easly .
although morgs spellshield wont always be usefull her q's long root time and her ult bring everything a team needs to the table and if your fed her w is more than a area denial.
annie has to be one of the easyest champions in leauge and with her passive you can not only set up easy wins for your team but grab them yourself with your insane damage andd cc.
aoe damage aoe stun and single target nuke (if you can call her e a nuke) not to mention her wall she brings the controll the the fight all supports love
he may only have a single target stun but the damage he brings to the table more than make up for it not to mention most of his damage is aoe. even if your skillshots arnt perfect you should still get off alot of damage in teamfights
with his high scailings he also does well mid while haveing that cc and tankyness
jungle
lots of cc and a good tank if you gank propperly it will almost always gate a kill for whatever lane your ganking.
now shen is my hidden op jungler because with everything he brings as a hyper tank monster with a full team taunt (if done right) with his ult make it so you can gank and save lanes while your on the other side of the map. (also with the new hydra by building nearly only tank you become a massive threat to everyone and a massive splitpushing threat)
another super tank able to almost alway ensure a kill on gank eventually come late game you can force a win on teamfight just by taunting the adc and let your team clean up once the adc finishes killing themself on your thornmail.
THE KING OFF CC almost always gets a kill on gank not to mention how tanky he gets brings nearly everythign a team needs to a comp.
adc
with tons of range you can keep safe and do damage even if you are lacking in mechanics or arnt great at kiteing.
tons of range and utlity with her passive, ult and e very easly to play and lots of damage to boot
with tons of long range poke with a slow and a root on ult that can stun more than one person great for when you wana turn fights and poke them down from a safe distance away.
IF you feel i missed someone let me know ill even give people builds for a champ if your willing to ask me good luck in solo que my fellow support mains
Good anywhere and good with anyone. Problem solved.
Jungle 
mid, he's my go-to if someone takes support from me. He's really easy to play and his turrets farm for you.
per AA. that's like 3 Anivias.
they are fairly simple, and each have decent kits with escapes and most have spells so if you are not an adc main that is good at dps with autos these caster type adcs like ez and corki with escapes can help you feel more comfortable
who gets countered by 
blitz just hook nerds and knockes em up
nami my baby got tons of poke heal and cc
with that passive of his you'll do tons of damage while still building only supportesk items. his q slows e knock up and w poke for days not to mention his high ass damage ult. most of the time you'll top the damage charts
poke heal stun and speedboost sona got everything while still being able to do damage if you build the right items
Can't get support? That's cool I'll mid/top/jungle with the same champ. ADC? Dodge city.
jungle (or top but that is probably harder) can also be a great choice. You can pick and choose what you will turn into late game, be it magic damage AoE threat, physical single target threat, tanky stun machine or some combination of those. The peels are pretty good if you run an AP Bruiser type of setup with a Rylai's, just stand near your adc and slow anyone who comes over and then stun them when they get to close.
(
since the meditation change should be viable... need a try)
mid : 
Bot carry : 
I know people complain about his E not being as effective, but it's still good at zoning people. In bronze, you'll catch people in them.
and 
its going to do next to nothing for you in lane unless the junler litteraly camps your lane and if thats the case your probebly freezing lane just infront of tower already
jung:
Jungle: 
ADC: 
