No Gnar on the new SKT skins?

Not always, while the players themselves get to request what champion they want their skin for, Riot doesn't always follow that suggestion.

The chosen champion is a champion the player is known for, not necessary the one they won their last game with.

Actually Faker picked Ahir in 2013 but the said they couldn't do it because of her popstar skin so they went with Zed. Most of these were predictable, the only one that caught me by surprise is SKT Sivir, Why? I'm almost positive that Bang requested Kalista, which is his most well known champion since he was undefeated on her at the time he won worlds.

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It's the champion that they like, such as Faker's Zed in the previous years ;D

Not always, Faker wanted ahri in s3, but because she had too many skins (LOL) they put it on zed instead.

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The players pick them. I honestly expected Rumble for Marin, since he used it so much, but I guess he picked Renekton instead.

In an interview MaRin said that since Rumble already had a good skin so he wanted Renekton. So I guess this one was expected.