Sivir ! How do I know? Well victorious skins go to champions that heavily affect the meta and professional play, Sivir was a highly contested ADC in most if not all the regions' spring and summer split games. Rito also said that the new victorious skin will go to a marksman.
Good luck getting to gold guys!
Ratchet Fortune3 votesMy thought was either or 
. Hopefully Sivir since she is my 2nd ADC main behind 
, and there is a 0% chance for Miss Fortune to get that victorious skin lol.
LionelLeon2 votesHope miss fortune becomes the strong lane bully she was meant to be, she isn't really good carry material in the late game, but she's a champ that makes sure the enemy doesn't snowball and carry
Beached Manatee1 votesEXCUSE ME! smacks smacks again She is a mega lane bully. Her q is where all of it lies, sure, but it's on a short cooldown and deals lots of damage to the second one hit. As well, her late game is extremely strong, for me at least, so I don't know what you're talking about.
Stars Shaper3 votesSurprise is Varus
Variks the Loyal2 votesYeah, probably Sivir. Only other ones I could see it maybe being are Lucian and Corki.
CubedJustice1 votesShe's probably been the most influential, but she already has a large amount of skins. If they base it purely off of influence, you're right, but I don't know if they will.
LionelLeon1 votesShe has 2 normal skins and 2 legacy skins, jarvan, Elise and morg have the same amt of skins or more, heck Janna even has a legendary skin
Finn Teh Human1 votesI'm praying that it's Vayne.
Lynxonyx1 votesDo not want.
xl Kirito lx1 votesHard to say who will get the Victorious skin.
Jinx has had an amazing showing in soloq through the first half of the season, Varus and Urgot have had respectable showing mid lane, and Caitlyn has just started to show up more constantly. Also worth not counting out Vayne, since the champion will always be played.