Those people that wanted to transform into animals were probably ruled so much by their lower reptilian brain and so full of rage and hate, mostly self-hate and hate for being "weak" due to some unresolved Trauma, that they got stuck living on that primitive circuit and now most likely look physically the way they only felt internally before. So they got exactly what they wanted. To bring the emotionally broken beast into physical manifestation.
Why else would they want to appear meaner and more beastial if it weren't because they felt vulnerable and broken as a human.
And even if they never admitted, even to themselves, their low self-esteem, brought on by one of these variables, made them want to look "special" and "cool". But you can't become anything other than what you really are.
Although true Lychans do exist, if we are to take various eyewitness reports of them seriously. And they can change from human to animal or humanimal form.
And I naturally assumed from the start that Larka didn't ask for animal/Lychan Shapeshiftings but changing one's human Appearance.
Which is brought on by a high degree of skill in what is usually called Invocation which is part of "The Art of Stalking".
Which is like Acting.... to the Nth degree.