I've played:
Singed vs Lux (victory) Hilarious because the kill score was like 30-15 but we just all built Banshees and Locket and one guy went full AP so we would just roam all over the map and be dicks and troll them and stuff- one time all five hit me with bindings and ulted me and I got away. We just kept pushing and disrespecting them until we won at like 50 minutes.
Kat vs Blitz (loss). I was against playing Kat from the start but one guy convinced the others it would be a good idea. So we loaded up game- and we saw our biggest counter. Me and one guy got pretty strong (I was like 22-7 I think) but the others fed and it was GG.
Rammus vs Yasuo (victory) So hilarious. We were all so tanky with Thornmail and DBC that they were doing more damage to themselves than we were to them. It did help that this was premade and my friends are pretty good (they trolled me and made me solo bot after I got Relic Shield lol, but I stole all his reds and Krugs). Ok. They also always missed their tornados, which makes me sad because I play a lot of Yasuo.
Tahm vs Bard (victory) I main Tahm and I got my teamates to do it with me. The endless Bard stuns were annoying but after we got tanky and started coordinating we caught out the pack leader a lot and one of us got Mikaels so he cleansed important guys of stuns. I was fairly fed (15-5ish) and it was very fun, especially agains a bunch of Bards building Wits End and Nashors and Runaans.
Skarner vs Bard (victory) We were actually doing bad at first. They didn't have jungle, and I had take smite, so I just roamed all over the map and I was quadruple buff by 10 minutes. Me and my midlaner were caught out at the Baron pit. I made a run for it and he died, so the Bards continued to chase me. Get this: 2 magical journey over to me once I get to my inner top turret (I was about half health) I stun both and turret finishes them off. Double Kill. The other comes soon after, he falls in a likewise manner. The fourth Bard tried to be smart and tunnel around me, but I stunned him too. Quadra Kill! At that point no one wanted to fight me, I soloed Drag (I got my Sheen and Warrior on that back) and my top lane Skarner also got fed and we both just snowballed all over them even though out mid Skarner had fed, no offense to him, because he was mid Skarner after all.
Jinx vs Morde (victory) No mobility or CC against a Jinx team? Good luck with that. Our midlaner got super fed, our bot went about even, and I was support top but I roamed and bought troll items like Zekes and Zhonyas and Zephyr. I helped our top get fed and we pushed them to inhibitors by 15. It was a bloodbath after that, I don't think they even got a dragon ghost once.
Bans were always Darius and Heimer, but I also saw a lot of Vel, Kat, Yasuo, Eve, and J4. Bard was popular it was wierd. He was strong early but his damage just doesn't compete lategame, especially with 5 sets of chimes to keep track of when most Bards can't even manage one!