70% win rate so far, 30 games played. Nearly all my losses occurred on the first day. True, some of those were genuinely unpleasant, but once people get the lee syndrome out of their systems and wake up to the meta (and yes, every game mode has its own meta), it's far easier to manipulate a win in this than any past specialty mode.
I realize Poro King is a glorified snowball fight and the point is a distraction from summoner's rift, but if you'd really like to tryhard it, here are some easy tips for winning more often than you lose:
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Ban popular champs with high win rates (sona, kat, ziggs, kog etc. this is a good listing
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Pick champs with high win rates but low popularity
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Favor disengage and cc like janna, fiddle, and lulu over champs with big in-your-face initiate ults like sejuani, amumu, or lissandra
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Focus the poro king before enemy players, or they will just return to the fight when they rez if the fight goes on for 20-30 seconds.
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Champs that protect towers in some way (Janna, Azir), are as powerful here as in regular ARAM. It's really quite hard to come back from losing the second tower unless you can match it immediately.
Let me give some reasoning. While Sona and Janna have equivalent win rates, #1 and #3 respectively right now, Sona is picked 3x as often. This means if Sona goes through, you get a high probability of a mirror match, whereas if you ban Sona and pick Janna for your own team, you stand a great chance of having the only ace in the hole.
I have 16 matches played as Janna in there and only one was a loss, and it was due to extenuating circumstances (a player dropped out). I've been really lucky getting the bans I want. I'm a jungler main with east coast ping, not a Janna main from Busan - nothing special going on here.
You don't only have to play Janna of course. Banning kat and akali but picking yasuo is also strong. Or take out sej and amumu but run rammus or malphite. But always try to have some synergy between your picks and your bans.
What if someone else is banning instead of you? Pick around their bans instead, however ridiculous they seem to be. Find whatever gap is out there and fill it.
The extra initiate mechanic in poro king leads to a majority of teams centered around engage champs. Expect this, and play disengage instead. Since most engage champs' engage abilities are long cooldown skill shots, a proper disengage/cc comp will always have out-play potential over them. You just wait out their long abilities.
Avoid games with more than 2 adcs on your team. More than one adc is strongly discouraged, and please for the love of urf don't pick graves, draven, or vayne. Literally any other adc is better in this mode by virtue of having some sort of cc or escape. Jinx and Sivir, followed by Varus, are currently the ones I find most effective. Jinx and Sivir can be engage or disengage as the situation requires, while Varus can poke until they try to all in you, at which point you have an ae root.
Lastly there is probably an MMR ladder unique to poro king the same as any new game mode. The more games you win, the better people you will get to play with, so beginnings are always painful.