Gangplank HARD COUNTERS RIVEN
The most important thing to remember in this matchup is that YOU ARE A PIRATE so it's impossible for you to lose. But just in case you're not too confident:
Masteries: At least 13 in Defense for +5 Armor, +30 Life, Reduced damage from champions, and Barrier mastery.
Summoners: Barrier/Flash
Runes: AD Red (standard), Armor Yellow (duh), ANY Blue (These can be Armor to make Riven cry harder, or Magic Resist, or even nothing at all, because you're a pirate and pirates can never die), Lifesteal Quintessences (to become even more immortal than you already were)
Start Doran's Shield/Bluepot OR Cloth/5 Bluepot
At level 1, press Q on Riven to see what she leveled up:
Broken Wings: Press Q until she's dead or backs. GG. YOU ARE A PIRATE!
Ki Burst: LOL. GG. YOU ARE A PIRATE!
Valor: Fight fire with fire. Max W. Obtain wombo combo (Shiv & IE) and press Q on their carry. GG. YOU ARE A PIRATE!
Original: http://forums.na.leagueoflegends.com/board/showthread.php?t=3989214
too good to not rep ost