Next Lunar Revel, let's start brainstorming
Skins need some time to develope, so if we have any suggestions for skins in the future line up we have to present them fairly early. And so I thought to myself, let's ask the community which champions they would like to see getting skins for the next celebration of the Chinese new year.
To get it out of the way immediately:
I think most people will agree that Sejuani will be part of the skin line.

The next year will be the year of the pig and in the past, Riot chose a champion representing the Zodiac of each year in some way. Last year we got Warwick and Nasus representing the dog, the year before that it was Azir as the rooster. The only champion related to pigs in any way is Sejuani and therefore she should be in the skin line.
Now to the other picks: what do you personally expect? Keep in mind that it would be great if the trio has some kind of theme (Azir as the lord, Garen and Vi as his guards; Lux as the Lunar Empress, Warwick and Nasus as the celestial dogs).
My own suggestions:
Sejuani would fit the Warring Kingdoms skin line the best in my opinion, as some kind of leader of either a warband or some bandits. With that thematic in mind, I could imagine the following champions going along with it:
Didn't have a skin in a while and she could use a skin inspired by Asian culture. Would fit the warrior theme well, too.
Could imagine her as a young and naive member of the bandits. There was a Warring Kingdoms skin concept in the internet that would look awesome. And she needs another not-worlds-related skin.
I know, this choice seems odd, but let me explain. Maybe Sejuani plundered an ancient tomb and found Galio, who is a jade golem possessed by a spirit, and now uses him for her own goals. (Inspired by the terracotta army)
Same concept like Galio, basically an ancient jade golem.
and
fit well...
(I would say Wukong but he has the Radiant skin already)
<-- (wikipedia says the last character is called also the "water buffalo")