>>64115132from most loli to least, out of the few you just gave me, I'd have to go
Gura = La+ > Biboo >= Shion > Kobo > Luna
Main being reason, Gura is peak EN loli in every way with La+ basically being the the JP equivalent
Biboo is right behind that with having just a bit of chest and is 1cm in between them in height and Shion is practically the JP equivalent but less child-like personality wise but more kusogaki
Kobo is argueably the most child-like personality wise but her body is the tallest and has a more developed chest and Luna is pretty much the JP equivalent but with a way more developed chest
I think the factors of a loli are essentially personality and looks, but looks most importantly
Looks depend on their size but mostly how they're potrayed/artstyle
That's why there's even a "debateable" tier that's in between loli and petite like with Rushia