As a person of Nordic descent (as little as that actually says) i fully support Sejuani's new look (s?). A warrior is not supposed to be looking like a.....peaceful noblewoman in armor? With soft skin and no outstanding muscle when said warrior is supposed to be known for physical might.
I thought about it earlier how Ashe is.....strangely thin for someone using a damm longbow but Seju was always a looking like a stick for someone who is swinging around a giant mace, riding her boar ( That develops legs!) while also having been training and fighting since a young age.
Although Ashe could be explained with her being a magic user, same for Leo---but shyv is not even fully human, who knows how dragons grow. They might be born super beefy and slim down as they train and gain density instead, clarification is needed on this point.
Which leaves Riven......She is supposed to be a Ki user but even lee who is another one looks like a greek statue....but Akali looks super slim and she does it as well...
Riven and akali could both stand to have more well defined bodies, Riven especially being a frontal fighter with a focus on power, akali can get away with being light and so but even a ninja should look like she trains i think since one can train the body without looking like a mountain of muscle.
My English is a bit lacking in some areas but i think being toned is the most accurate description for that? Lol´s female champions could stand to be a bit more "toned".
And lastly i wish to say that i think new Seju looks really good visually^^