Hello guys. I play LoL from like early "1st" season and decided to help out some people which are still playing duo-queues (dynamic queue but you've got my point), especially in this thread, bot lane: marksman-support role. If this helps atleast one person, it's success and worth my time doing it.
Marksman [ADC]
[My rating]
Bad picks:
Azir - it's kinda meh with full damage build, he will be deleted in teamfights easily.
Jayce - he is strong, but that's all. His full potential can be showed in mid or top lane, not bot.
Kennen - mobile champ, but he have bad ad-scaling. He is much better ap top/mid.
Teemo - no escape at all, also ap is better bully.
Urgot - if you are not asian, don't you dare to pick him. I mean, he is not bad, but I think like 99,99% of LoL community can't play him... so just don't.
Average picks:
Corki - really small range and big mana costs if it goes for poke.
Draven - this was really hard to write it here in this section, but he is really not mobile adc, that's why he's here.
Jinx - same as Draven, her mobility comes only from kill/assist which is kinda worse than Draven.
Kindred - early game with her is really hard. She can have more pressure if she is in jungle.
Quinn - honestly, she is much stronger on top lane, since she can put more pressure on every lane and snowball games.
Varus - again, immobile champion and kinda fall off this season.
Solid meta picks:
Ashe - good early game poke, level 6 fight initiations, global ultimate.
Caitlyn - godlike poke, have escape with traps (W) or jump-back with additional damage bonus(E), "global lasthit ultimate".
Ezreal - good poke whole game, blue Ezreal is still working so pretty much if he is fed, it's unkillable (assasins shut up), global ultimate which affects whole enemy team.
Graves - great burst, fast pusher, good 1v1 champion.
Jhin - got stun (W), solid poke, his traps are invisible, "global ultimate".
Kalista - can make good vision even without wards, have great teamfight potential.
Kog'maw - good poke and even better burst.
Lucian - good poke, good 1v1 champion and pusher.
Miss Fortune - great poke, great teamfight champion, can work 1v2 really well
Sivir - early game poke is awesome (Q), awesome combo for 1v1/1v2 (Q+W), ultimate for chasing or running away is great option to re-group.
Tristana - great escape potential (even from assasins with R), fast tower pusher.
Twitch - really good initiation champ, also "assasin" marksman with his Q or it could be used as escape.
Vayne - good 1v1/2v2 champ, great ad scaling and really great pick for mid/late game fights.
Support
[My rating]
Bad picks:
Anivia - she need sustain to do something and let's be honest, what support knows how to play mid-laner. (Not many can play Anivia tho)
Heimerdinger - if you don't wanna steal your adc farm just don't pick him as supp. Go for top/mid lane so your turrets can do their work right.
Orianna - so squishy and she is not that useful in mid/late game without damage.
Syndra - never ever saw that as support, so yea, it's not that awesome. Can't really support/buff or anything else, your adc = useless.
Taliyah - just DON'T pick this champion. One word: WEAK. (You might protest, but I am writting about supports not mid laners and yea, this was listed as support for some reason.)
Average picks:
Ashe - I just laughed really hard there, she has great poke and can save your adc ass with ult easily.
Blitzcrank - Great for early game kills, but when your team is behind, he is useless.
Fiddlesticks - Fear and silence are awesome things for support. He is in this group because he is so squishy and tbh, he doesn't have real escape.
Kayle - Heal and ultimate are great but her E is useless if she doesn't have damage.
Lux - Well... yes. This is here because she is so immobile as well, if she misses combo and your adc goes in...rip. She is better on mid.
Nami - She's not that awesome this season.
Nunu - Tanky and have good annoying poke but not real initiation nor escape.
Tahm Kench - This champ is easy to play but hard to master so yeah, better play him on top lane. He is better front line AND dmg dealer than support.
Zyra - Immobile and if she doesn't go ap in mid/late game, she can't do anything in teamfights. (personal experience)
Solid meta picks:
Alistar - Awesome initiation, great dive potential.
Annie - It's one of those champions which everyone hates on almost every lane.
Bard - Great lane bully, can just hold enemy back line or front line with his ult.
Braum - Awesome initiation, good poke, good dive potential.
Janna - Shields, slows, heals - annoying and great. She can save life with almost every spell.
Karma - Poke and shields, with stun = great aggressive support.
Leona - Great early game powerspike, awesome initiation and can perma-stun delete any squishy champ.
Lulu - Good poke, great trade 2v2 potential, awesome ultimate/shield combo in teamfights.
Morgana - Looooong Q "stun", so 2v2 is awesome, also can help with E, so your adc won't get stunned, awesome ultimate in teamfights.
Sona - Early game poke, teamfight potential is great with her ultimate
Soraka - Heals, heals everywhere. And can pretty much bully enemy with her Q.
Taric - Awesome teamfight champ, early game is kinda hard if he does not land any stun.
Thresh - Great to catch enemy out of position and make plays with jungler (lantern opop), 2 slows are also helpful (E + R).
Zilean - Stun + damage and ressurect one champ in teamfight is awesome. He also have slow for enemy or speed up for adc. Is your adc behind by level? Zilean says: "No problem, bro. I will give you free exp".
Pick it, to win it
Bully lane combo
Braum - Miss Fortune
Aggressive, yet really high-damage dealer combo. Spam MF's E and Braum's Q. This combo can be played also in teamfights, just mash your R really hard. xD
Braum - Lucian
Lucian's passive make him really great in bullying enemy. Can also make R+R teamfight combo.
Leona - Tristana/Caitlyn
Level 2 powerspike and you can easily burn a lot of enemy summoner spells or even get a kill.
Alistar/Morgana - Sivir
Again level 2 powerspike and same as with Leona - Trist/Cait combo, easy kill or burned enemy summs.
Lulu - Caitlyn
Cait Q + Lulu's speed boost on Cait + her Q through Cait it's really annoying combo. Also can make some plays with Lulu ulti in teamfights!
Safe and aggressive
Janna - Vayne
Working really well whether u are aggressive or trying to run away.
Thresh - Kalista
Thresh's hook and Kalista's ultimate can make really great combo or really great escape.
Morgana - Jhin
Stuns, stuns everywhere. Also black shield and traps are great.
Soraka - Ezreal/Twitch
They can also be classified as bully but you can play them safe too. Remember: Soraka in back line is just freaking annoying.
Surprise
Leona - Ashe/Draven
Ultimate (R) combo and burst is really hard to predict.
Bard - Caitlyn
Bard uses angles = stun and well, you will be surprised how much damage you can deal when your enemy is double-stunned (Cait, just don't forget on your W).
Thresh - Tristana
+random jungler with thrown lantern. Trist can jump behind enemy and use ult to make some good easy pick.
Karma - Sivir
Double-ult combo? No problem!
Annie - Graves/Kog'maw
Burst as hell.
Having fun
[All combos listed down below are playable, but try it in normals first. Play it at ur own risk at rankeds. You can be easily reported if you fail that.]
Blitzcrank - Alistar
One of the best combos I've ever played with my friend.
Blitzcrank - Thresh
Adc Thresh isn't that bad but buy Statik/BOTRK first.
Morgana - Lux
Well, this is really, really easy to play combo. Time your bindings right and you will destroy enemy bot lane.
Cassiopea - Twitch
Twitch's poison works with Cassiopea's sooo... have fun. xD
Nautilus - Volibear
One good hook = burned summs or kill. Both should buy Relic Shield for sustain!
------------
Not sure what to add next, so... if you have any other ideas, just feel free to let me know!