>>57828080>>57828830It's hard to properly judge at this time. Shiori and Fuwawa only have Live2D and reference sheets to go off of. 3D is always the final arbiter of canon size since you either getting multiple angles to judge or the actual 3D model to download and examine. However, I don't think anyone could realistically suggest that Shiori is bigger than Fuwawa.
According to this totally scientific video
https://www.youtube.com/watch?v=GASN9g_lmkIFuwawa is just below Lamy tier, in the same group as Calli, Marine, Fauna and Watame. Meanwhile Shiori is among Miko, IRyS, Amelia and Chloe. Above the median but not huge.
I say all this as someone who has a strong preference for fatty tiddy Shiori art.